1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "utilities/align.hpp" 29 #include "utilities/globalDefinitions.hpp" 30 #include "utilities/macros.hpp" 31 32 #include <float.h> // for DBL_MAX 33 34 // The larger HeapWordSize for 64bit requires larger heaps 35 // for the same application running in 64bit. See bug 4967770. 36 // The minimum alignment to a heap word size is done. Other 37 // parts of the memory system may require additional alignment 38 // and are responsible for those alignments. 39 #ifdef _LP64 40 #define ScaleForWordSize(x) align_down_((x) * 13 / 10, HeapWordSize) 41 #else 42 #define ScaleForWordSize(x) (x) 43 #endif 44 45 // use this for flags that are true per default in the tiered build 46 // but false in non-tiered builds, and vice versa 47 #ifdef TIERED 48 #define trueInTiered true 49 #define falseInTiered false 50 #else 51 #define trueInTiered false 52 #define falseInTiered true 53 #endif 54 55 #include CPU_HEADER(globals) 56 #include OS_HEADER(globals) 57 #include OS_CPU_HEADER(globals) 58 #ifdef COMPILER1 59 #include CPU_HEADER(c1_globals) 60 #include OS_HEADER(c1_globals) 61 #endif 62 #ifdef COMPILER2 63 #include CPU_HEADER(c2_globals) 64 #include OS_HEADER(c2_globals) 65 #endif 66 67 #if !defined(COMPILER1) && !defined(COMPILER2) && !INCLUDE_JVMCI 68 define_pd_global(bool, BackgroundCompilation, false); 69 define_pd_global(bool, UseTLAB, false); 70 define_pd_global(bool, CICompileOSR, false); 71 define_pd_global(bool, UseTypeProfile, false); 72 define_pd_global(bool, UseOnStackReplacement, false); 73 define_pd_global(bool, InlineIntrinsics, false); 74 define_pd_global(bool, PreferInterpreterNativeStubs, true); 75 define_pd_global(bool, ProfileInterpreter, false); 76 define_pd_global(bool, ProfileTraps, false); 77 define_pd_global(bool, TieredCompilation, false); 78 79 define_pd_global(intx, CompileThreshold, 0); 80 81 define_pd_global(intx, OnStackReplacePercentage, 0); 82 define_pd_global(bool, ResizeTLAB, false); 83 define_pd_global(intx, FreqInlineSize, 0); 84 define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 85 define_pd_global(bool, InlineClassNatives, true); 86 define_pd_global(bool, InlineUnsafeOps, true); 87 define_pd_global(uintx, InitialCodeCacheSize, 160*K); 88 define_pd_global(uintx, ReservedCodeCacheSize, 32*M); 89 define_pd_global(uintx, NonProfiledCodeHeapSize, 0); 90 define_pd_global(uintx, ProfiledCodeHeapSize, 0); 91 define_pd_global(uintx, NonNMethodCodeHeapSize, 32*M); 92 93 define_pd_global(uintx, CodeCacheExpansionSize, 32*K); 94 define_pd_global(uintx, CodeCacheMinBlockLength, 1); 95 define_pd_global(uintx, CodeCacheMinimumUseSpace, 200*K); 96 define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 97 define_pd_global(bool, NeverActAsServerClassMachine, true); 98 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 99 #define CI_COMPILER_COUNT 0 100 #else 101 102 #if COMPILER2_OR_JVMCI 103 #define CI_COMPILER_COUNT 2 104 #else 105 #define CI_COMPILER_COUNT 1 106 #endif // COMPILER2_OR_JVMCI 107 108 #endif // no compilers 109 110 // string type aliases used only in this file 111 typedef const char* ccstr; 112 typedef const char* ccstrlist; // represents string arguments which accumulate 113 114 // function type that will construct default range string 115 typedef const char* (*RangeStrFunc)(void); 116 117 struct Flag { 118 enum Flags { 119 // latest value origin 120 DEFAULT = 0, 121 COMMAND_LINE = 1, 122 ENVIRON_VAR = 2, 123 CONFIG_FILE = 3, 124 MANAGEMENT = 4, 125 ERGONOMIC = 5, 126 ATTACH_ON_DEMAND = 6, 127 INTERNAL = 7, 128 129 LAST_VALUE_ORIGIN = INTERNAL, 130 VALUE_ORIGIN_BITS = 4, 131 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 132 133 // flag kind 134 KIND_PRODUCT = 1 << 4, 135 KIND_MANAGEABLE = 1 << 5, 136 KIND_DIAGNOSTIC = 1 << 6, 137 KIND_EXPERIMENTAL = 1 << 7, 138 KIND_NOT_PRODUCT = 1 << 8, 139 KIND_DEVELOP = 1 << 9, 140 KIND_PLATFORM_DEPENDENT = 1 << 10, 141 KIND_READ_WRITE = 1 << 11, 142 KIND_C1 = 1 << 12, 143 KIND_C2 = 1 << 13, 144 KIND_ARCH = 1 << 14, 145 KIND_LP64_PRODUCT = 1 << 15, 146 KIND_COMMERCIAL = 1 << 16, 147 KIND_JVMCI = 1 << 17, 148 149 // set this bit if the flag was set on the command line 150 ORIG_COMMAND_LINE = 1 << 18, 151 152 KIND_MASK = ~(VALUE_ORIGIN_MASK | ORIG_COMMAND_LINE) 153 }; 154 155 enum Error { 156 // no error 157 SUCCESS = 0, 158 // flag name is missing 159 MISSING_NAME, 160 // flag value is missing 161 MISSING_VALUE, 162 // error parsing the textual form of the value 163 WRONG_FORMAT, 164 // flag is not writable 165 NON_WRITABLE, 166 // flag value is outside of its bounds 167 OUT_OF_BOUNDS, 168 // flag value violates its constraint 169 VIOLATES_CONSTRAINT, 170 // there is no flag with the given name 171 INVALID_FLAG, 172 // the flag can only be set only on command line during invocation of the VM 173 COMMAND_LINE_ONLY, 174 // the flag may only be set once 175 SET_ONLY_ONCE, 176 // the flag is not writable in this combination of product/debug build 177 CONSTANT, 178 // other, unspecified error related to setting the flag 179 ERR_OTHER 180 }; 181 182 enum MsgType { 183 NONE = 0, 184 DIAGNOSTIC_FLAG_BUT_LOCKED, 185 EXPERIMENTAL_FLAG_BUT_LOCKED, 186 DEVELOPER_FLAG_BUT_PRODUCT_BUILD, 187 NOTPRODUCT_FLAG_BUT_PRODUCT_BUILD, 188 COMMERCIAL_FLAG_BUT_DISABLED, 189 COMMERCIAL_FLAG_BUT_LOCKED 190 }; 191 192 const char* _type; 193 const char* _name; 194 void* _addr; 195 NOT_PRODUCT(const char* _doc;) 196 Flags _flags; 197 size_t _name_len; 198 199 // points to all Flags static array 200 static Flag* flags; 201 202 // number of flags 203 static size_t numFlags; 204 205 static Flag* find_flag(const char* name) { return find_flag(name, strlen(name), true, true); }; 206 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 207 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 208 209 static const char* get_int_default_range_str(); 210 static const char* get_uint_default_range_str(); 211 static const char* get_intx_default_range_str(); 212 static const char* get_uintx_default_range_str(); 213 static const char* get_uint64_t_default_range_str(); 214 static const char* get_size_t_default_range_str(); 215 static const char* get_double_default_range_str(); 216 217 Flag::Error check_writable(bool changed); 218 219 bool is_bool() const; 220 bool get_bool() const; 221 Flag::Error set_bool(bool value); 222 223 bool is_int() const; 224 int get_int() const; 225 Flag::Error set_int(int value); 226 227 bool is_uint() const; 228 uint get_uint() const; 229 Flag::Error set_uint(uint value); 230 231 bool is_intx() const; 232 intx get_intx() const; 233 Flag::Error set_intx(intx value); 234 235 bool is_uintx() const; 236 uintx get_uintx() const; 237 Flag::Error set_uintx(uintx value); 238 239 bool is_uint64_t() const; 240 uint64_t get_uint64_t() const; 241 Flag::Error set_uint64_t(uint64_t value); 242 243 bool is_size_t() const; 244 size_t get_size_t() const; 245 Flag::Error set_size_t(size_t value); 246 247 bool is_double() const; 248 double get_double() const; 249 Flag::Error set_double(double value); 250 251 bool is_ccstr() const; 252 bool ccstr_accumulates() const; 253 ccstr get_ccstr() const; 254 Flag::Error set_ccstr(ccstr value); 255 256 Flags get_origin(); 257 void set_origin(Flags origin); 258 259 size_t get_name_length(); 260 261 bool is_default(); 262 bool is_ergonomic(); 263 bool is_command_line(); 264 void set_command_line(); 265 266 bool is_product() const; 267 bool is_manageable() const; 268 bool is_diagnostic() const; 269 bool is_experimental() const; 270 bool is_notproduct() const; 271 bool is_develop() const; 272 bool is_read_write() const; 273 bool is_commercial() const; 274 275 bool is_constant_in_binary() const; 276 277 bool is_unlocker() const; 278 bool is_unlocked() const; 279 bool is_writeable() const; 280 bool is_external() const; 281 282 bool is_unlocker_ext() const; 283 bool is_unlocked_ext() const; 284 bool is_writeable_ext() const; 285 bool is_external_ext() const; 286 287 void clear_diagnostic(); 288 289 Flag::MsgType get_locked_message(char*, int) const; 290 Flag::MsgType get_locked_message_ext(char*, int) const; 291 292 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 293 void print_on(outputStream* st, bool withComments = false, bool printRanges = false); 294 void print_kind(outputStream* st, unsigned int width); 295 void print_origin(outputStream* st, unsigned int width); 296 void print_as_flag(outputStream* st); 297 298 static const char* flag_error_str(Flag::Error error); 299 }; 300 301 // debug flags control various aspects of the VM and are global accessible 302 303 // use FlagSetting to temporarily change some debug flag 304 // e.g. FlagSetting fs(DebugThisAndThat, true); 305 // restored to previous value upon leaving scope 306 class FlagSetting { 307 bool val; 308 bool* flag; 309 public: 310 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 311 ~FlagSetting() { *flag = val; } 312 }; 313 314 315 class CounterSetting { 316 intx* counter; 317 public: 318 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 319 ~CounterSetting() { (*counter)--; } 320 }; 321 322 class IntFlagSetting { 323 int val; 324 int* flag; 325 public: 326 IntFlagSetting(int& fl, int newValue) { flag = &fl; val = fl; fl = newValue; } 327 ~IntFlagSetting() { *flag = val; } 328 }; 329 330 class UIntFlagSetting { 331 uint val; 332 uint* flag; 333 public: 334 UIntFlagSetting(uint& fl, uint newValue) { flag = &fl; val = fl; fl = newValue; } 335 ~UIntFlagSetting() { *flag = val; } 336 }; 337 338 class UIntXFlagSetting { 339 uintx val; 340 uintx* flag; 341 public: 342 UIntXFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 343 ~UIntXFlagSetting() { *flag = val; } 344 }; 345 346 class DoubleFlagSetting { 347 double val; 348 double* flag; 349 public: 350 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 351 ~DoubleFlagSetting() { *flag = val; } 352 }; 353 354 class SizeTFlagSetting { 355 size_t val; 356 size_t* flag; 357 public: 358 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 359 ~SizeTFlagSetting() { *flag = val; } 360 }; 361 362 // Helper class for temporarily saving the value of a flag during a scope. 363 template <size_t SIZE> 364 class FlagGuard { 365 unsigned char _value[SIZE]; 366 void* const _addr; 367 368 // Hide operator new, this class should only be allocated on the stack. 369 // NOTE: Cannot include memory/allocation.hpp here due to circular 370 // dependencies. 371 void* operator new(size_t size) throw(); 372 void* operator new [](size_t size) throw(); 373 374 public: 375 FlagGuard(void* flag_addr) : _addr(flag_addr) { 376 memcpy(_value, _addr, SIZE); 377 } 378 379 ~FlagGuard() { 380 memcpy(_addr, _value, SIZE); 381 } 382 }; 383 384 #define FLAG_GUARD(f) FlagGuard<sizeof(f)> f ## _guard(&f) 385 386 class CommandLineFlags { 387 public: 388 static Flag::Error boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 389 static Flag::Error boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); } 390 static Flag::Error boolAtPut(Flag* flag, bool* value, Flag::Flags origin); 391 static Flag::Error boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 392 static Flag::Error boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 393 394 static Flag::Error intAt(const char* name, size_t len, int* value, bool allow_locked = false, bool return_flag = false); 395 static Flag::Error intAt(const char* name, int* value, bool allow_locked = false, bool return_flag = false) { return intAt(name, strlen(name), value, allow_locked, return_flag); } 396 static Flag::Error intAtPut(Flag* flag, int* value, Flag::Flags origin); 397 static Flag::Error intAtPut(const char* name, size_t len, int* value, Flag::Flags origin); 398 static Flag::Error intAtPut(const char* name, int* value, Flag::Flags origin) { return intAtPut(name, strlen(name), value, origin); } 399 400 static Flag::Error uintAt(const char* name, size_t len, uint* value, bool allow_locked = false, bool return_flag = false); 401 static Flag::Error uintAt(const char* name, uint* value, bool allow_locked = false, bool return_flag = false) { return uintAt(name, strlen(name), value, allow_locked, return_flag); } 402 static Flag::Error uintAtPut(Flag* flag, uint* value, Flag::Flags origin); 403 static Flag::Error uintAtPut(const char* name, size_t len, uint* value, Flag::Flags origin); 404 static Flag::Error uintAtPut(const char* name, uint* value, Flag::Flags origin) { return uintAtPut(name, strlen(name), value, origin); } 405 406 static Flag::Error intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 407 static Flag::Error intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); } 408 static Flag::Error intxAtPut(Flag* flag, intx* value, Flag::Flags origin); 409 static Flag::Error intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 410 static Flag::Error intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 411 412 static Flag::Error uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 413 static Flag::Error uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); } 414 static Flag::Error uintxAtPut(Flag* flag, uintx* value, Flag::Flags origin); 415 static Flag::Error uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 416 static Flag::Error uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 417 418 static Flag::Error size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 419 static Flag::Error size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false) { return size_tAt(name, strlen(name), value, allow_locked, return_flag); } 420 static Flag::Error size_tAtPut(Flag* flag, size_t* value, Flag::Flags origin); 421 static Flag::Error size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 422 static Flag::Error size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 423 424 static Flag::Error uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 425 static Flag::Error uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); } 426 static Flag::Error uint64_tAtPut(Flag* flag, uint64_t* value, Flag::Flags origin); 427 static Flag::Error uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 428 static Flag::Error uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 429 430 static Flag::Error doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 431 static Flag::Error doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); } 432 static Flag::Error doubleAtPut(Flag* flag, double* value, Flag::Flags origin); 433 static Flag::Error doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 434 static Flag::Error doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 435 436 static Flag::Error ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 437 static Flag::Error ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); } 438 // Contract: Flag will make private copy of the incoming value. 439 // Outgoing value is always malloc-ed, and caller MUST call free. 440 static Flag::Error ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 441 static Flag::Error ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 442 443 // Returns false if name is not a command line flag. 444 static bool wasSetOnCmdline(const char* name, bool* value); 445 static void printSetFlags(outputStream* out); 446 447 // printRanges will print out flags type, name and range values as expected by -XX:+PrintFlagsRanges 448 static void printFlags(outputStream* out, bool withComments, bool printRanges = false); 449 450 static void verify() PRODUCT_RETURN; 451 }; 452 453 // use this for flags that are true by default in the debug version but 454 // false in the optimized version, and vice versa 455 #ifdef ASSERT 456 #define trueInDebug true 457 #define falseInDebug false 458 #else 459 #define trueInDebug false 460 #define falseInDebug true 461 #endif 462 463 // use this for flags that are true per default in the product build 464 // but false in development builds, and vice versa 465 #ifdef PRODUCT 466 #define trueInProduct true 467 #define falseInProduct false 468 #else 469 #define trueInProduct false 470 #define falseInProduct true 471 #endif 472 473 // develop flags are settable / visible only during development and are constant in the PRODUCT version 474 // product flags are always settable / visible 475 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 476 477 // A flag must be declared with one of the following types: 478 // bool, int, uint, intx, uintx, size_t, ccstr, double, or uint64_t. 479 // The type "ccstr" is an alias for "const char*" and is used 480 // only in this file, because the macrology requires single-token type names. 481 482 // Note: Diagnostic options not meant for VM tuning or for product modes. 483 // They are to be used for VM quality assurance or field diagnosis 484 // of VM bugs. They are hidden so that users will not be encouraged to 485 // try them as if they were VM ordinary execution options. However, they 486 // are available in the product version of the VM. Under instruction 487 // from support engineers, VM customers can turn them on to collect 488 // diagnostic information about VM problems. To use a VM diagnostic 489 // option, you must first specify +UnlockDiagnosticVMOptions. 490 // (This master switch also affects the behavior of -Xprintflags.) 491 // 492 // experimental flags are in support of features that are not 493 // part of the officially supported product, but are available 494 // for experimenting with. They could, for example, be performance 495 // features that may not have undergone full or rigorous QA, but which may 496 // help performance in some cases and released for experimentation 497 // by the community of users and developers. This flag also allows one to 498 // be able to build a fully supported product that nonetheless also 499 // ships with some unsupported, lightly tested, experimental features. 500 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 501 // UnlockExperimentalVMOptions flag, which allows the control and 502 // modification of the experimental flags. 503 // 504 // Nota bene: neither diagnostic nor experimental options should be used casually, 505 // and they are not supported on production loads, except under explicit 506 // direction from support engineers. 507 // 508 // manageable flags are writeable external product flags. 509 // They are dynamically writeable through the JDK management interface 510 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 511 // These flags are external exported interface (see CCC). The list of 512 // manageable flags can be queried programmatically through the management 513 // interface. 514 // 515 // A flag can be made as "manageable" only if 516 // - the flag is defined in a CCC as an external exported interface. 517 // - the VM implementation supports dynamic setting of the flag. 518 // This implies that the VM must *always* query the flag variable 519 // and not reuse state related to the flag state at any given time. 520 // - you want the flag to be queried programmatically by the customers. 521 // 522 // product_rw flags are writeable internal product flags. 523 // They are like "manageable" flags but for internal/private use. 524 // The list of product_rw flags are internal/private flags which 525 // may be changed/removed in a future release. It can be set 526 // through the management interface to get/set value 527 // when the name of flag is supplied. 528 // 529 // A flag can be made as "product_rw" only if 530 // - the VM implementation supports dynamic setting of the flag. 531 // This implies that the VM must *always* query the flag variable 532 // and not reuse state related to the flag state at any given time. 533 // 534 // Note that when there is a need to support develop flags to be writeable, 535 // it can be done in the same way as product_rw. 536 // 537 // range is a macro that will expand to min and max arguments for range 538 // checking code if provided - see commandLineFlagRangeList.hpp 539 // 540 // constraint is a macro that will expand to custom function call 541 // for constraint checking if provided - see commandLineFlagConstraintList.hpp 542 // 543 // writeable is a macro that controls if and how the value can change during the runtime 544 // 545 // writeable(Always) is optional and allows the flag to have its value changed 546 // without any limitations at any time 547 // 548 // writeable(Once) flag value's can be only set once during the lifetime of VM 549 // 550 // writeable(CommandLineOnly) flag value's can be only set from command line 551 // (multiple times allowed) 552 // 553 554 555 #define RUNTIME_FLAGS(develop, \ 556 develop_pd, \ 557 product, \ 558 product_pd, \ 559 diagnostic, \ 560 diagnostic_pd, \ 561 experimental, \ 562 notproduct, \ 563 manageable, \ 564 product_rw, \ 565 lp64_product, \ 566 range, \ 567 constraint, \ 568 writeable) \ 569 \ 570 lp64_product(bool, UseCompressedOops, false, \ 571 "Use 32-bit object references in 64-bit VM. " \ 572 "lp64_product means flag is always constant in 32 bit VM") \ 573 \ 574 lp64_product(bool, UseCompressedClassPointers, false, \ 575 "Use 32-bit class pointers in 64-bit VM. " \ 576 "lp64_product means flag is always constant in 32 bit VM") \ 577 \ 578 notproduct(bool, CheckCompressedOops, true, \ 579 "Generate checks in encoding/decoding code in debug VM") \ 580 \ 581 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 582 "Heap allocation steps through preferred address regions to find" \ 583 " where it can allocate the heap. Number of steps to take per " \ 584 "region.") \ 585 range(1, max_uintx) \ 586 \ 587 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 588 "Default object alignment in bytes, 8 is minimum") \ 589 range(8, 256) \ 590 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 591 \ 592 product(bool, AssumeMP, true, \ 593 "(Deprecated) Instruct the VM to assume multiple processors are available")\ 594 \ 595 /* UseMembar is theoretically a temp flag used for memory barrier */ \ 596 /* removal testing. It was supposed to be removed before FCS but has */ \ 597 /* been re-added (see 6401008) */ \ 598 product_pd(bool, UseMembar, \ 599 "(Unstable) Issues membars on thread state transitions") \ 600 \ 601 develop(bool, CleanChunkPoolAsync, true, \ 602 "Clean the chunk pool asynchronously") \ 603 \ 604 product_pd(bool, ThreadLocalHandshakes, \ 605 "Use thread-local polls instead of global poll for safepoints.") \ 606 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \ 607 \ 608 diagnostic(uint, HandshakeTimeout, 0, \ 609 "If nonzero set a timeout in milliseconds for handshakes") \ 610 \ 611 experimental(bool, AlwaysSafeConstructors, false, \ 612 "Force safe construction, as if all fields are final.") \ 613 \ 614 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 615 "Enable normal processing of flags relating to field diagnostics")\ 616 \ 617 experimental(bool, UnlockExperimentalVMOptions, false, \ 618 "Enable normal processing of flags relating to experimental " \ 619 "features") \ 620 \ 621 product(bool, JavaMonitorsInStackTrace, true, \ 622 "Print information about Java monitor locks when the stacks are" \ 623 "dumped") \ 624 \ 625 product_pd(bool, UseLargePages, \ 626 "Use large page memory") \ 627 \ 628 product_pd(bool, UseLargePagesIndividualAllocation, \ 629 "Allocate large pages individually for better affinity") \ 630 \ 631 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 632 "Fail large pages individual allocation") \ 633 \ 634 product(bool, UseLargePagesInMetaspace, false, \ 635 "Use large page memory in metaspace. " \ 636 "Only used if UseLargePages is enabled.") \ 637 \ 638 product(bool, UseNUMA, false, \ 639 "Use NUMA if available") \ 640 \ 641 product(bool, UseNUMAInterleaving, false, \ 642 "Interleave memory across NUMA nodes if available") \ 643 \ 644 product(size_t, NUMAInterleaveGranularity, 2*M, \ 645 "Granularity to use for NUMA interleaving on Windows OS") \ 646 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 647 \ 648 product(bool, ForceNUMA, false, \ 649 "Force NUMA optimizations on single-node/UMA systems") \ 650 \ 651 product(uintx, NUMAChunkResizeWeight, 20, \ 652 "Percentage (0-100) used to weight the current sample when " \ 653 "computing exponentially decaying average for " \ 654 "AdaptiveNUMAChunkSizing") \ 655 range(0, 100) \ 656 \ 657 product(size_t, NUMASpaceResizeRate, 1*G, \ 658 "Do not reallocate more than this amount per collection") \ 659 range(0, max_uintx) \ 660 \ 661 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 662 "Enable adaptive chunk sizing for NUMA") \ 663 \ 664 product(bool, NUMAStats, false, \ 665 "Print NUMA stats in detailed heap information") \ 666 \ 667 product(uintx, NUMAPageScanRate, 256, \ 668 "Maximum number of pages to include in the page scan procedure") \ 669 range(0, max_uintx) \ 670 \ 671 product_pd(bool, NeedsDeoptSuspend, \ 672 "True for register window machines (sparc/ia64)") \ 673 \ 674 product(intx, UseSSE, 99, \ 675 "Highest supported SSE instructions set on x86/x64") \ 676 range(0, 99) \ 677 \ 678 product(bool, UseAES, false, \ 679 "Control whether AES instructions are used when available") \ 680 \ 681 product(bool, UseFMA, false, \ 682 "Control whether FMA instructions are used when available") \ 683 \ 684 product(bool, UseSHA, false, \ 685 "Control whether SHA instructions are used when available") \ 686 \ 687 diagnostic(bool, UseGHASHIntrinsics, false, \ 688 "Use intrinsics for GHASH versions of crypto") \ 689 \ 690 product(size_t, LargePageSizeInBytes, 0, \ 691 "Large page size (0 to let VM choose the page size)") \ 692 range(0, max_uintx) \ 693 \ 694 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 695 "Use large pages if maximum heap is at least this big") \ 696 range(0, max_uintx) \ 697 \ 698 product(bool, ForceTimeHighResolution, false, \ 699 "Using high time resolution (for Win32 only)") \ 700 \ 701 develop(bool, TracePcPatching, false, \ 702 "Trace usage of frame::patch_pc") \ 703 \ 704 develop(bool, TraceRelocator, false, \ 705 "Trace the bytecode relocator") \ 706 \ 707 develop(bool, TraceLongCompiles, false, \ 708 "Print out every time compilation is longer than " \ 709 "a given threshold") \ 710 \ 711 develop(bool, SafepointALot, false, \ 712 "Generate a lot of safepoints. This works with " \ 713 "GuaranteedSafepointInterval") \ 714 \ 715 product_pd(bool, BackgroundCompilation, \ 716 "A thread requesting compilation is not blocked during " \ 717 "compilation") \ 718 \ 719 product(bool, PrintVMQWaitTime, false, \ 720 "Print out the waiting time in VM operation queue") \ 721 \ 722 product(bool, MethodFlushing, true, \ 723 "Reclamation of zombie and not-entrant methods") \ 724 \ 725 develop(bool, VerifyStack, false, \ 726 "Verify stack of each thread when it is entering a runtime call") \ 727 \ 728 diagnostic(bool, ForceUnreachable, false, \ 729 "Make all non code cache addresses to be unreachable by " \ 730 "forcing use of 64bit literal fixups") \ 731 \ 732 notproduct(bool, StressDerivedPointers, false, \ 733 "Force scavenge when a derived pointer is detected on stack " \ 734 "after rtm call") \ 735 \ 736 develop(bool, TraceDerivedPointers, false, \ 737 "Trace traversal of derived pointers on stack") \ 738 \ 739 notproduct(bool, TraceCodeBlobStacks, false, \ 740 "Trace stack-walk of codeblobs") \ 741 \ 742 product(bool, PrintJNIResolving, false, \ 743 "Used to implement -v:jni") \ 744 \ 745 notproduct(bool, PrintRewrites, false, \ 746 "Print methods that are being rewritten") \ 747 \ 748 product(bool, UseInlineCaches, true, \ 749 "Use Inline Caches for virtual calls ") \ 750 \ 751 diagnostic(bool, InlineArrayCopy, true, \ 752 "Inline arraycopy native that is known to be part of " \ 753 "base library DLL") \ 754 \ 755 diagnostic(bool, InlineObjectHash, true, \ 756 "Inline Object::hashCode() native that is known to be part " \ 757 "of base library DLL") \ 758 \ 759 diagnostic(bool, InlineNatives, true, \ 760 "Inline natives that are known to be part of base library DLL") \ 761 \ 762 diagnostic(bool, InlineMathNatives, true, \ 763 "Inline SinD, CosD, etc.") \ 764 \ 765 diagnostic(bool, InlineClassNatives, true, \ 766 "Inline Class.isInstance, etc") \ 767 \ 768 diagnostic(bool, InlineThreadNatives, true, \ 769 "Inline Thread.currentThread, etc") \ 770 \ 771 diagnostic(bool, InlineUnsafeOps, true, \ 772 "Inline memory ops (native methods) from Unsafe") \ 773 \ 774 product(bool, CriticalJNINatives, true, \ 775 "Check for critical JNI entry points") \ 776 \ 777 notproduct(bool, StressCriticalJNINatives, false, \ 778 "Exercise register saving code in critical natives") \ 779 \ 780 diagnostic(bool, UseAESIntrinsics, false, \ 781 "Use intrinsics for AES versions of crypto") \ 782 \ 783 diagnostic(bool, UseAESCTRIntrinsics, false, \ 784 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 785 \ 786 diagnostic(bool, UseSHA1Intrinsics, false, \ 787 "Use intrinsics for SHA-1 crypto hash function. " \ 788 "Requires that UseSHA is enabled.") \ 789 \ 790 diagnostic(bool, UseSHA256Intrinsics, false, \ 791 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 792 "Requires that UseSHA is enabled.") \ 793 \ 794 diagnostic(bool, UseSHA512Intrinsics, false, \ 795 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 796 "Requires that UseSHA is enabled.") \ 797 \ 798 diagnostic(bool, UseCRC32Intrinsics, false, \ 799 "use intrinsics for java.util.zip.CRC32") \ 800 \ 801 diagnostic(bool, UseCRC32CIntrinsics, false, \ 802 "use intrinsics for java.util.zip.CRC32C") \ 803 \ 804 diagnostic(bool, UseAdler32Intrinsics, false, \ 805 "use intrinsics for java.util.zip.Adler32") \ 806 \ 807 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 808 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 809 \ 810 diagnostic(ccstrlist, DisableIntrinsic, "", \ 811 "do not expand intrinsics whose (internal) names appear here") \ 812 \ 813 develop(bool, TraceCallFixup, false, \ 814 "Trace all call fixups") \ 815 \ 816 develop(bool, DeoptimizeALot, false, \ 817 "Deoptimize at every exit from the runtime system") \ 818 \ 819 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 820 "A comma separated list of bcis to deoptimize at") \ 821 \ 822 product(bool, DeoptimizeRandom, false, \ 823 "Deoptimize random frames on random exit from the runtime system")\ 824 \ 825 notproduct(bool, ZombieALot, false, \ 826 "Create zombies (non-entrant) at exit from the runtime system") \ 827 \ 828 product(bool, UnlinkSymbolsALot, false, \ 829 "Unlink unreferenced symbols from the symbol table at safepoints")\ 830 \ 831 notproduct(bool, WalkStackALot, false, \ 832 "Trace stack (no print) at every exit from the runtime system") \ 833 \ 834 product(bool, Debugging, false, \ 835 "Set when executing debug methods in debug.cpp " \ 836 "(to prevent triggering assertions)") \ 837 \ 838 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 839 "Enable strict checks that safepoints cannot happen for threads " \ 840 "that use NoSafepointVerifier") \ 841 \ 842 notproduct(bool, VerifyLastFrame, false, \ 843 "Verify oops on last frame on entry to VM") \ 844 \ 845 product(bool, FailOverToOldVerifier, true, \ 846 "Fail over to old verifier when split verifier fails") \ 847 \ 848 product(bool, SafepointTimeout, false, \ 849 "Time out and warn or fail after SafepointTimeoutDelay " \ 850 "milliseconds if failed to reach safepoint") \ 851 \ 852 develop(bool, DieOnSafepointTimeout, false, \ 853 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 854 \ 855 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 856 /* typically, at most a few retries are needed */ \ 857 product(intx, SuspendRetryCount, 50, \ 858 "Maximum retry count for an external suspend request") \ 859 range(0, max_intx) \ 860 \ 861 product(intx, SuspendRetryDelay, 5, \ 862 "Milliseconds to delay per retry (* current_retry_count)") \ 863 range(0, max_intx) \ 864 \ 865 product(bool, AssertOnSuspendWaitFailure, false, \ 866 "Assert/Guarantee on external suspend wait failure") \ 867 \ 868 product(bool, TraceSuspendWaitFailures, false, \ 869 "Trace external suspend wait failures") \ 870 \ 871 product(bool, MaxFDLimit, true, \ 872 "Bump the number of file descriptors to maximum in Solaris") \ 873 \ 874 diagnostic(bool, LogEvents, true, \ 875 "Enable the various ring buffer event logs") \ 876 \ 877 diagnostic(uintx, LogEventsBufferEntries, 10, \ 878 "Number of ring buffer event logs") \ 879 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 880 \ 881 product(bool, BytecodeVerificationRemote, true, \ 882 "Enable the Java bytecode verifier for remote classes") \ 883 \ 884 product(bool, BytecodeVerificationLocal, false, \ 885 "Enable the Java bytecode verifier for local classes") \ 886 \ 887 develop(bool, ForceFloatExceptions, trueInDebug, \ 888 "Force exceptions on FP stack under/overflow") \ 889 \ 890 develop(bool, VerifyStackAtCalls, false, \ 891 "Verify that the stack pointer is unchanged after calls") \ 892 \ 893 develop(bool, TraceJavaAssertions, false, \ 894 "Trace java language assertions") \ 895 \ 896 notproduct(bool, VerifyCodeCache, false, \ 897 "Verify code cache on memory allocation/deallocation") \ 898 \ 899 develop(bool, UseMallocOnly, false, \ 900 "Use only malloc/free for allocation (no resource area/arena)") \ 901 \ 902 develop(bool, PrintMallocStatistics, false, \ 903 "Print malloc/free statistics") \ 904 \ 905 develop(bool, ZapResourceArea, trueInDebug, \ 906 "Zap freed resource/arena space with 0xABABABAB") \ 907 \ 908 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 909 "Zap freed VM handle space with 0xBCBCBCBC") \ 910 \ 911 notproduct(bool, ZapStackSegments, trueInDebug, \ 912 "Zap allocated/freed stack segments with 0xFADFADED") \ 913 \ 914 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 915 "Zap unused heap space with 0xBAADBABE") \ 916 \ 917 develop(bool, CheckZapUnusedHeapArea, false, \ 918 "Check zapping of unused heap space") \ 919 \ 920 develop(bool, ZapFillerObjects, trueInDebug, \ 921 "Zap filler objects with 0xDEAFBABE") \ 922 \ 923 develop(bool, PrintVMMessages, true, \ 924 "Print VM messages on console") \ 925 \ 926 notproduct(uintx, ErrorHandlerTest, 0, \ 927 "If > 0, provokes an error after VM initialization; the value " \ 928 "determines which error to provoke. See test_error_handler() " \ 929 "in vmError.cpp.") \ 930 \ 931 notproduct(uintx, TestCrashInErrorHandler, 0, \ 932 "If > 0, provokes an error inside VM error handler (a secondary " \ 933 "crash). see test_error_handler() in vmError.cpp") \ 934 \ 935 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 936 "If true, tests SafeFetch inside error handler.") \ 937 \ 938 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 939 "If true, simulates an unresponsive error handler.") \ 940 \ 941 develop(bool, Verbose, false, \ 942 "Print additional debugging information from other modes") \ 943 \ 944 develop(bool, PrintMiscellaneous, false, \ 945 "Print uncategorized debugging information (requires +Verbose)") \ 946 \ 947 develop(bool, WizardMode, false, \ 948 "Print much more debugging information") \ 949 \ 950 product(bool, ShowMessageBoxOnError, false, \ 951 "Keep process alive on VM fatal error") \ 952 \ 953 product(bool, CreateCoredumpOnCrash, true, \ 954 "Create core/mini dump on VM fatal error") \ 955 \ 956 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 957 "Timeout, in seconds, to limit the time spent on writing an " \ 958 "error log in case of a crash.") \ 959 range(0, (uint64_t)max_jlong/1000) \ 960 \ 961 product_pd(bool, UseOSErrorReporting, \ 962 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 963 \ 964 product(bool, SuppressFatalErrorMessage, false, \ 965 "Report NO fatal error message (avoid deadlock)") \ 966 \ 967 product(ccstrlist, OnError, "", \ 968 "Run user-defined commands on fatal error; see VMError.cpp " \ 969 "for examples") \ 970 \ 971 product(ccstrlist, OnOutOfMemoryError, "", \ 972 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 973 \ 974 manageable(bool, HeapDumpBeforeFullGC, false, \ 975 "Dump heap to file before any major stop-the-world GC") \ 976 \ 977 manageable(bool, HeapDumpAfterFullGC, false, \ 978 "Dump heap to file after any major stop-the-world GC") \ 979 \ 980 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 981 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 982 \ 983 manageable(ccstr, HeapDumpPath, NULL, \ 984 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 985 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 986 "in the working directory)") \ 987 \ 988 develop(bool, BreakAtWarning, false, \ 989 "Execute breakpoint upon encountering VM warning") \ 990 \ 991 develop(bool, UseFakeTimers, false, \ 992 "Tell whether the VM should use system time or a fake timer") \ 993 \ 994 product(ccstr, NativeMemoryTracking, "off", \ 995 "Native memory tracking options") \ 996 \ 997 diagnostic(bool, PrintNMTStatistics, false, \ 998 "Print native memory tracking summary data if it is on") \ 999 \ 1000 diagnostic(bool, LogCompilation, false, \ 1001 "Log compilation activity in detail to LogFile") \ 1002 \ 1003 product(bool, PrintCompilation, false, \ 1004 "Print compilations") \ 1005 \ 1006 diagnostic(bool, TraceNMethodInstalls, false, \ 1007 "Trace nmethod installation") \ 1008 \ 1009 diagnostic(intx, ScavengeRootsInCode, 2, \ 1010 "0: do not allow scavengable oops in the code cache; " \ 1011 "1: allow scavenging from the code cache; " \ 1012 "2: emit as many constants as the compiler can see") \ 1013 range(0, 2) \ 1014 \ 1015 product(bool, AlwaysRestoreFPU, false, \ 1016 "Restore the FPU control word after every JNI call (expensive)") \ 1017 \ 1018 diagnostic(bool, PrintCompilation2, false, \ 1019 "Print additional statistics per compilation") \ 1020 \ 1021 diagnostic(bool, PrintAdapterHandlers, false, \ 1022 "Print code generated for i2c/c2i adapters") \ 1023 \ 1024 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1025 "Verify that i2c/c2i adapters are called properly") \ 1026 \ 1027 develop(bool, VerifyAdapterSharing, false, \ 1028 "Verify that the code for shared adapters is the equivalent") \ 1029 \ 1030 diagnostic(bool, PrintAssembly, false, \ 1031 "Print assembly code (using external disassembler.so)") \ 1032 \ 1033 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1034 "Print options string passed to disassembler.so") \ 1035 \ 1036 notproduct(bool, PrintNMethodStatistics, false, \ 1037 "Print a summary statistic for the generated nmethods") \ 1038 \ 1039 diagnostic(bool, PrintNMethods, false, \ 1040 "Print assembly code for nmethods when generated") \ 1041 \ 1042 diagnostic(bool, PrintNativeNMethods, false, \ 1043 "Print assembly code for native nmethods when generated") \ 1044 \ 1045 develop(bool, PrintDebugInfo, false, \ 1046 "Print debug information for all nmethods when generated") \ 1047 \ 1048 develop(bool, PrintRelocations, false, \ 1049 "Print relocation information for all nmethods when generated") \ 1050 \ 1051 develop(bool, PrintDependencies, false, \ 1052 "Print dependency information for all nmethods when generated") \ 1053 \ 1054 develop(bool, PrintExceptionHandlers, false, \ 1055 "Print exception handler tables for all nmethods when generated") \ 1056 \ 1057 develop(bool, StressCompiledExceptionHandlers, false, \ 1058 "Exercise compiled exception handlers") \ 1059 \ 1060 develop(bool, InterceptOSException, false, \ 1061 "Start debugger when an implicit OS (e.g. NULL) " \ 1062 "exception happens") \ 1063 \ 1064 product(bool, PrintCodeCache, false, \ 1065 "Print the code cache memory usage when exiting") \ 1066 \ 1067 develop(bool, PrintCodeCache2, false, \ 1068 "Print detailed usage information on the code cache when exiting")\ 1069 \ 1070 product(bool, PrintCodeCacheOnCompilation, false, \ 1071 "Print the code cache memory usage each time a method is " \ 1072 "compiled") \ 1073 \ 1074 diagnostic(bool, PrintStubCode, false, \ 1075 "Print generated stub code") \ 1076 \ 1077 product(bool, StackTraceInThrowable, true, \ 1078 "Collect backtrace in throwable when exception happens") \ 1079 \ 1080 product(bool, OmitStackTraceInFastThrow, true, \ 1081 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1082 \ 1083 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1084 "Print bytecode statistics when dumping profiler output") \ 1085 \ 1086 product(bool, ProfilerRecordPC, false, \ 1087 "Collect ticks for each 16 byte interval of compiled code") \ 1088 \ 1089 product(bool, ProfileVM, false, \ 1090 "Profile ticks that fall within VM (either in the VM Thread " \ 1091 "or VM code called through stubs)") \ 1092 \ 1093 product(bool, ProfileIntervals, false, \ 1094 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1095 \ 1096 notproduct(bool, ProfilerCheckIntervals, false, \ 1097 "Collect and print information on spacing of profiler ticks") \ 1098 \ 1099 product(bool, PrintWarnings, true, \ 1100 "Print JVM warnings to output stream") \ 1101 \ 1102 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1103 "Print warnings for stalled SpinLocks") \ 1104 \ 1105 product(bool, RegisterFinalizersAtInit, true, \ 1106 "Register finalizable objects at end of Object.<init> or " \ 1107 "after allocation") \ 1108 \ 1109 develop(bool, RegisterReferences, true, \ 1110 "Tell whether the VM should register soft/weak/final/phantom " \ 1111 "references") \ 1112 \ 1113 develop(bool, IgnoreRewrites, false, \ 1114 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1115 "This is unsafe!") \ 1116 \ 1117 develop(bool, PrintCodeCacheExtension, false, \ 1118 "Print extension of code cache") \ 1119 \ 1120 develop(bool, UsePrivilegedStack, true, \ 1121 "Enable the security JVM functions") \ 1122 \ 1123 develop(bool, ProtectionDomainVerification, true, \ 1124 "Verify protection domain before resolution in system dictionary")\ 1125 \ 1126 product(bool, ClassUnloading, true, \ 1127 "Do unloading of classes") \ 1128 \ 1129 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1130 "Do unloading of classes with a concurrent marking cycle") \ 1131 \ 1132 develop(bool, DisableStartThread, false, \ 1133 "Disable starting of additional Java threads " \ 1134 "(for debugging only)") \ 1135 \ 1136 develop(bool, MemProfiling, false, \ 1137 "Write memory usage profiling to log file") \ 1138 \ 1139 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1140 "Print the system dictionary at exit") \ 1141 \ 1142 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 1143 "Dynamically resize system dictionaries as needed") \ 1144 \ 1145 product(bool, AlwaysLockClassLoader, false, \ 1146 "Require the VM to acquire the class loader lock before calling " \ 1147 "loadClass() even for class loaders registering " \ 1148 "as parallel capable") \ 1149 \ 1150 product(bool, AllowParallelDefineClass, false, \ 1151 "Allow parallel defineClass requests for class loaders " \ 1152 "registering as parallel capable") \ 1153 \ 1154 product_pd(bool, DontYieldALot, \ 1155 "Throw away obvious excess yield calls") \ 1156 \ 1157 develop(bool, UseDetachedThreads, true, \ 1158 "Use detached threads that are recycled upon termination " \ 1159 "(for Solaris only)") \ 1160 \ 1161 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 1162 "Disable the use of stack guard pages if the JVM is loaded " \ 1163 "on the primordial process thread") \ 1164 \ 1165 product(bool, UseLWPSynchronization, true, \ 1166 "Use LWP-based instead of libthread-based synchronization " \ 1167 "(SPARC only)") \ 1168 \ 1169 experimental(ccstr, SyncKnobs, NULL, \ 1170 "(Unstable) Various monitor synchronization tunables") \ 1171 \ 1172 experimental(intx, EmitSync, 0, \ 1173 "(Unsafe, Unstable) " \ 1174 "Control emission of inline sync fast-path code") \ 1175 \ 1176 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1177 range(0, max_jint) \ 1178 \ 1179 product(bool, MonitorInUseLists, true, "Track Monitors for Deflation") \ 1180 \ 1181 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 1182 "Percentage of used monitors before triggering cleanup " \ 1183 "safepoint which deflates monitors (0 is off). " \ 1184 "The check is performed on GuaranteedSafepointInterval.") \ 1185 range(0, 100) \ 1186 \ 1187 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1188 "Experimental Sync flags") \ 1189 \ 1190 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1191 \ 1192 diagnostic(bool, InlineNotify, true, "intrinsify subset of notify") \ 1193 \ 1194 experimental(intx, hashCode, 5, \ 1195 "(Unstable) select hashCode generation algorithm") \ 1196 \ 1197 product(bool, FilterSpuriousWakeups, true, \ 1198 "When true prevents OS-level spurious, or premature, wakeups " \ 1199 "from Object.wait (Ignored for Windows)") \ 1200 \ 1201 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1202 \ 1203 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1204 \ 1205 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1206 \ 1207 develop(bool, UsePthreads, false, \ 1208 "Use pthread-based instead of libthread-based synchronization " \ 1209 "(SPARC only)") \ 1210 \ 1211 product(bool, ReduceSignalUsage, false, \ 1212 "Reduce the use of OS signals in Java and/or the VM") \ 1213 \ 1214 develop_pd(bool, ShareVtableStubs, \ 1215 "Share vtable stubs (smaller code but worse branch prediction") \ 1216 \ 1217 develop(bool, LoadLineNumberTables, true, \ 1218 "Tell whether the class file parser loads line number tables") \ 1219 \ 1220 develop(bool, LoadLocalVariableTables, true, \ 1221 "Tell whether the class file parser loads local variable tables") \ 1222 \ 1223 develop(bool, LoadLocalVariableTypeTables, true, \ 1224 "Tell whether the class file parser loads local variable type" \ 1225 "tables") \ 1226 \ 1227 product(bool, AllowUserSignalHandlers, false, \ 1228 "Do not complain if the application installs signal handlers " \ 1229 "(Solaris & Linux only)") \ 1230 \ 1231 product(bool, UseSignalChaining, true, \ 1232 "Use signal-chaining to invoke signal handlers installed " \ 1233 "by the application (Solaris & Linux only)") \ 1234 \ 1235 product(bool, AllowJNIEnvProxy, false, \ 1236 "Allow JNIEnv proxies for jdbx") \ 1237 \ 1238 product(bool, RestoreMXCSROnJNICalls, false, \ 1239 "Restore MXCSR when returning from JNI calls") \ 1240 \ 1241 product(bool, CheckJNICalls, false, \ 1242 "Verify all arguments to JNI calls") \ 1243 \ 1244 product(bool, CheckEndorsedAndExtDirs, false, \ 1245 "Verify the endorsed and extension directories are not used") \ 1246 \ 1247 product(bool, UseFastJNIAccessors, true, \ 1248 "Use optimized versions of Get<Primitive>Field") \ 1249 \ 1250 product(intx, MaxJNILocalCapacity, 65536, \ 1251 "Maximum allowable local JNI handle capacity to " \ 1252 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1253 "where <= 0 is unlimited, default: 65536") \ 1254 range(min_intx, max_intx) \ 1255 \ 1256 product(bool, EagerXrunInit, false, \ 1257 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1258 "but not all -Xrun libraries may support the state of the VM " \ 1259 "at this time") \ 1260 \ 1261 product(bool, PreserveAllAnnotations, false, \ 1262 "Preserve RuntimeInvisibleAnnotations as well " \ 1263 "as RuntimeVisibleAnnotations") \ 1264 \ 1265 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1266 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1267 \ 1268 product(bool, UseXMMForArrayCopy, false, \ 1269 "Use SSE2 MOVQ instruction for Arraycopy") \ 1270 \ 1271 product(intx, FieldsAllocationStyle, 1, \ 1272 "0 - type based with oops first, " \ 1273 "1 - with oops last, " \ 1274 "2 - oops in super and sub classes are together") \ 1275 range(0, 2) \ 1276 \ 1277 product(bool, CompactFields, true, \ 1278 "Allocate nonstatic fields in gaps between previous fields") \ 1279 \ 1280 notproduct(bool, PrintFieldLayout, false, \ 1281 "Print field layout for each class") \ 1282 \ 1283 /* Need to limit the extent of the padding to reasonable size. */\ 1284 /* 8K is well beyond the reasonable HW cache line size, even with */\ 1285 /* aggressive prefetching, while still leaving the room for segregating */\ 1286 /* among the distinct pages. */\ 1287 product(intx, ContendedPaddingWidth, 128, \ 1288 "How many bytes to pad the fields/classes marked @Contended with")\ 1289 range(0, 8192) \ 1290 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 1291 \ 1292 product(bool, EnableContended, true, \ 1293 "Enable @Contended annotation support") \ 1294 \ 1295 product(bool, RestrictContended, true, \ 1296 "Restrict @Contended to trusted classes") \ 1297 \ 1298 product(bool, UseBiasedLocking, true, \ 1299 "Enable biased locking in JVM") \ 1300 \ 1301 product(intx, BiasedLockingStartupDelay, 0, \ 1302 "Number of milliseconds to wait before enabling biased locking") \ 1303 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 1304 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 1305 \ 1306 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1307 "Print statistics of biased locking in JVM") \ 1308 \ 1309 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1310 "Threshold of number of revocations per type to try to " \ 1311 "rebias all objects in the heap of that type") \ 1312 range(0, max_intx) \ 1313 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 1314 \ 1315 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1316 "Threshold of number of revocations per type to permanently " \ 1317 "revoke biases of all objects in the heap of that type") \ 1318 range(0, max_intx) \ 1319 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 1320 \ 1321 product(intx, BiasedLockingDecayTime, 25000, \ 1322 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1323 "type after previous bulk rebias") \ 1324 range(500, max_intx) \ 1325 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 1326 \ 1327 product(bool, ExitOnOutOfMemoryError, false, \ 1328 "JVM exits on the first occurrence of an out-of-memory error") \ 1329 \ 1330 product(bool, CrashOnOutOfMemoryError, false, \ 1331 "JVM aborts, producing an error log and core/mini dump, on the " \ 1332 "first occurrence of an out-of-memory error") \ 1333 \ 1334 /* tracing */ \ 1335 \ 1336 develop(bool, StressRewriter, false, \ 1337 "Stress linktime bytecode rewriting") \ 1338 \ 1339 product(ccstr, TraceJVMTI, NULL, \ 1340 "Trace flags for JVMTI functions and events") \ 1341 \ 1342 /* This option can change an EMCP method into an obsolete method. */ \ 1343 /* This can affect tests that except specific methods to be EMCP. */ \ 1344 /* This option should be used with caution. */ \ 1345 product(bool, StressLdcRewrite, false, \ 1346 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1347 \ 1348 /* change to false by default sometime after Mustang */ \ 1349 product(bool, VerifyMergedCPBytecodes, true, \ 1350 "Verify bytecodes after RedefineClasses constant pool merging") \ 1351 \ 1352 develop(bool, TraceBytecodes, false, \ 1353 "Trace bytecode execution") \ 1354 \ 1355 develop(bool, TraceICs, false, \ 1356 "Trace inline cache changes") \ 1357 \ 1358 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1359 "Trace method invocation counter overflow") \ 1360 \ 1361 develop(bool, TraceInlineCacheClearing, false, \ 1362 "Trace clearing of inline caches in nmethods") \ 1363 \ 1364 develop(bool, TraceDependencies, false, \ 1365 "Trace dependencies") \ 1366 \ 1367 develop(bool, VerifyDependencies, trueInDebug, \ 1368 "Exercise and verify the compilation dependency mechanism") \ 1369 \ 1370 develop(bool, TraceNewOopMapGeneration, false, \ 1371 "Trace OopMapGeneration") \ 1372 \ 1373 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1374 "Trace OopMapGeneration: print detailed cell states") \ 1375 \ 1376 develop(bool, TimeOopMap, false, \ 1377 "Time calls to GenerateOopMap::compute_map() in sum") \ 1378 \ 1379 develop(bool, TimeOopMap2, false, \ 1380 "Time calls to GenerateOopMap::compute_map() individually") \ 1381 \ 1382 develop(bool, TraceOopMapRewrites, false, \ 1383 "Trace rewriting of method oops during oop map generation") \ 1384 \ 1385 develop(bool, TraceICBuffer, false, \ 1386 "Trace usage of IC buffer") \ 1387 \ 1388 develop(bool, TraceCompiledIC, false, \ 1389 "Trace changes of compiled IC") \ 1390 \ 1391 /* gc */ \ 1392 \ 1393 product(bool, UseSerialGC, false, \ 1394 "Use the Serial garbage collector") \ 1395 \ 1396 product(bool, UseG1GC, false, \ 1397 "Use the Garbage-First garbage collector") \ 1398 \ 1399 product(bool, UseParallelGC, false, \ 1400 "Use the Parallel Scavenge garbage collector") \ 1401 \ 1402 product(bool, UseParallelOldGC, false, \ 1403 "Use the Parallel Old garbage collector") \ 1404 \ 1405 product(uintx, HeapMaximumCompactionInterval, 20, \ 1406 "How often should we maximally compact the heap (not allowing " \ 1407 "any dead space)") \ 1408 range(0, max_uintx) \ 1409 \ 1410 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1411 "The collection count for the first maximum compaction") \ 1412 range(0, max_uintx) \ 1413 \ 1414 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1415 "Use maximum compaction in the Parallel Old garbage collector " \ 1416 "for a system GC") \ 1417 \ 1418 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1419 "The mean used by the parallel compact dead wood " \ 1420 "limiter (a number between 0-100)") \ 1421 range(0, 100) \ 1422 \ 1423 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1424 "The standard deviation used by the parallel compact dead wood " \ 1425 "limiter (a number between 0-100)") \ 1426 range(0, 100) \ 1427 \ 1428 product(uint, ParallelGCThreads, 0, \ 1429 "Number of parallel threads parallel gc will use") \ 1430 constraint(ParallelGCThreadsConstraintFunc,AfterErgo) \ 1431 \ 1432 diagnostic(bool, UseSemaphoreGCThreadsSynchronization, true, \ 1433 "Use semaphore synchronization for the GC Threads, " \ 1434 "instead of synchronization based on mutexes") \ 1435 \ 1436 product(bool, UseDynamicNumberOfGCThreads, true, \ 1437 "Dynamically choose the number of threads up to a maximum of " \ 1438 "ParallelGCThreads parallel collectors will use for garbage " \ 1439 "collection work") \ 1440 \ 1441 diagnostic(bool, InjectGCWorkerCreationFailure, false, \ 1442 "Inject thread creation failures for " \ 1443 "UseDynamicNumberOfGCThreads") \ 1444 \ 1445 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1446 "Force dynamic selection of the number of " \ 1447 "parallel threads parallel gc will use to aid debugging") \ 1448 \ 1449 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1450 "Size of heap (bytes) per GC thread used in calculating the " \ 1451 "number of GC threads") \ 1452 range((size_t)os::vm_page_size(), (size_t)max_uintx) \ 1453 \ 1454 product(uint, ConcGCThreads, 0, \ 1455 "Number of threads concurrent gc will use") \ 1456 constraint(ConcGCThreadsConstraintFunc,AfterErgo) \ 1457 \ 1458 product(uint, GCTaskTimeStampEntries, 200, \ 1459 "Number of time stamp entries per gc worker thread") \ 1460 range(1, max_jint) \ 1461 \ 1462 product(bool, AlwaysTenure, false, \ 1463 "Always tenure objects in eden (ParallelGC only)") \ 1464 \ 1465 product(bool, NeverTenure, false, \ 1466 "Never tenure objects in eden, may tenure on overflow " \ 1467 "(ParallelGC only)") \ 1468 \ 1469 product(bool, ScavengeBeforeFullGC, true, \ 1470 "Scavenge youngest generation before each full GC.") \ 1471 \ 1472 product(bool, UseConcMarkSweepGC, false, \ 1473 "Use Concurrent Mark-Sweep GC in the old generation") \ 1474 \ 1475 product(bool, ExplicitGCInvokesConcurrent, false, \ 1476 "A System.gc() request invokes a concurrent collection; " \ 1477 "(effective only when using concurrent collectors)") \ 1478 \ 1479 product(bool, GCLockerInvokesConcurrent, false, \ 1480 "The exit of a JNI critical section necessitating a scavenge, " \ 1481 "also kicks off a background concurrent collection") \ 1482 \ 1483 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1484 "How much the GC can expand the eden by while the GC locker " \ 1485 "is active (as a percentage)") \ 1486 range(0, 100) \ 1487 \ 1488 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1489 "Number of times to retry allocations when " \ 1490 "blocked by the GC locker") \ 1491 range(0, max_uintx) \ 1492 \ 1493 product(bool, UseCMSBestFit, true, \ 1494 "Use CMS best fit allocation strategy") \ 1495 \ 1496 product(uintx, ParallelGCBufferWastePct, 10, \ 1497 "Wasted fraction of parallel allocation buffer") \ 1498 range(0, 100) \ 1499 \ 1500 product(uintx, TargetPLABWastePct, 10, \ 1501 "Target wasted space in last buffer as percent of overall " \ 1502 "allocation") \ 1503 range(1, 100) \ 1504 \ 1505 product(uintx, PLABWeight, 75, \ 1506 "Percentage (0-100) used to weight the current sample when " \ 1507 "computing exponentially decaying average for ResizePLAB") \ 1508 range(0, 100) \ 1509 \ 1510 product(bool, ResizePLAB, true, \ 1511 "Dynamically resize (survivor space) promotion LAB's") \ 1512 \ 1513 product(int, ParGCArrayScanChunk, 50, \ 1514 "Scan a subset of object array and push remainder, if array is " \ 1515 "bigger than this") \ 1516 range(1, max_jint/3) \ 1517 \ 1518 product(bool, ParGCUseLocalOverflow, false, \ 1519 "Instead of a global overflow list, use local overflow stacks") \ 1520 \ 1521 product(bool, ParGCTrimOverflow, true, \ 1522 "Eagerly trim the local overflow lists " \ 1523 "(when ParGCUseLocalOverflow)") \ 1524 \ 1525 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1526 "Simulate work queue overflow in ParNew") \ 1527 \ 1528 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1529 "An `interval' counter that determines how frequently " \ 1530 "we simulate overflow; a smaller number increases frequency") \ 1531 \ 1532 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1533 "The desired number of objects to claim from the overflow list") \ 1534 range(0, max_uintx) \ 1535 \ 1536 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1537 "The number of strides per worker thread that we divide up the " \ 1538 "card table scanning work into") \ 1539 range(1, max_uintx) \ 1540 constraint(ParGCStridesPerThreadConstraintFunc,AfterErgo) \ 1541 \ 1542 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1543 "The number of cards in each chunk of the parallel chunks used " \ 1544 "during card table scanning") \ 1545 range(1, max_intx) \ 1546 constraint(ParGCCardsPerStrideChunkConstraintFunc,AfterMemoryInit)\ 1547 \ 1548 product(uintx, OldPLABWeight, 50, \ 1549 "Percentage (0-100) used to weight the current sample when " \ 1550 "computing exponentially decaying average for resizing " \ 1551 "OldPLABSize") \ 1552 range(0, 100) \ 1553 \ 1554 product(bool, ResizeOldPLAB, true, \ 1555 "Dynamically resize (old gen) promotion LAB's") \ 1556 \ 1557 product(size_t, CMSOldPLABMax, 1024, \ 1558 "Maximum size of CMS gen promotion LAB caches per worker " \ 1559 "per block size") \ 1560 range(1, max_uintx) \ 1561 constraint(CMSOldPLABMaxConstraintFunc,AfterMemoryInit) \ 1562 \ 1563 product(size_t, CMSOldPLABMin, 16, \ 1564 "Minimum size of CMS gen promotion LAB caches per worker " \ 1565 "per block size") \ 1566 range(1, max_uintx) \ 1567 constraint(CMSOldPLABMinConstraintFunc,AfterMemoryInit) \ 1568 \ 1569 product(uintx, CMSOldPLABNumRefills, 4, \ 1570 "Nominal number of refills of CMS gen promotion LAB cache " \ 1571 "per worker per block size") \ 1572 range(1, max_uintx) \ 1573 \ 1574 product(bool, CMSOldPLABResizeQuicker, false, \ 1575 "React on-the-fly during a scavenge to a sudden " \ 1576 "change in block demand rate") \ 1577 \ 1578 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1579 "The tolerance of the phase-change detector for on-the-fly " \ 1580 "PLAB resizing during a scavenge") \ 1581 range(1, max_uintx) \ 1582 \ 1583 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1584 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1585 "during a scavenge") \ 1586 range(1, max_uintx) \ 1587 \ 1588 product(bool, AlwaysPreTouch, false, \ 1589 "Force all freshly committed pages to be pre-touched") \ 1590 \ 1591 product(size_t, PreTouchParallelChunkSize, 1 * G, \ 1592 "Per-thread chunk size for parallel memory pre-touch.") \ 1593 range(1, SIZE_MAX / 2) \ 1594 \ 1595 product_pd(size_t, CMSYoungGenPerWorker, \ 1596 "The maximum size of young gen chosen by default per GC worker " \ 1597 "thread available") \ 1598 range(1, max_uintx) \ 1599 \ 1600 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1601 "Percentage (0-100) used to add conservatism when computing the " \ 1602 "duty cycle") \ 1603 range(0, 100) \ 1604 \ 1605 product(uintx, CMSExpAvgFactor, 50, \ 1606 "Percentage (0-100) used to weight the current sample when " \ 1607 "computing exponential averages for CMS statistics") \ 1608 range(0, 100) \ 1609 \ 1610 product(uintx, CMS_FLSWeight, 75, \ 1611 "Percentage (0-100) used to weight the current sample when " \ 1612 "computing exponentially decaying averages for CMS FLS " \ 1613 "statistics") \ 1614 range(0, 100) \ 1615 \ 1616 product(uintx, CMS_FLSPadding, 1, \ 1617 "The multiple of deviation from mean to use for buffering " \ 1618 "against volatility in free list demand") \ 1619 range(0, max_juint) \ 1620 \ 1621 product(uintx, FLSCoalescePolicy, 2, \ 1622 "CMS: aggressiveness level for coalescing, increasing " \ 1623 "from 0 to 4") \ 1624 range(0, 4) \ 1625 \ 1626 product(bool, FLSAlwaysCoalesceLarge, false, \ 1627 "CMS: larger free blocks are always available for coalescing") \ 1628 \ 1629 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1630 "CMS: the smaller the percentage the greater the coalescing " \ 1631 "force") \ 1632 range(0.0, 1.0) \ 1633 \ 1634 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1635 "CMS: the factor by which to inflate estimated demand of small " \ 1636 "block sizes to prevent coalescing with an adjoining block") \ 1637 range(0.0, DBL_MAX) \ 1638 \ 1639 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1640 "CMS: the factor by which to inflate estimated demand of large " \ 1641 "block sizes to prevent coalescing with an adjoining block") \ 1642 range(0.0, DBL_MAX) \ 1643 \ 1644 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1645 "CMS: the factor by which to inflate estimated demand of small " \ 1646 "block sizes to prevent splitting to supply demand for smaller " \ 1647 "blocks") \ 1648 range(0.0, DBL_MAX) \ 1649 \ 1650 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1651 "CMS: the factor by which to inflate estimated demand of large " \ 1652 "block sizes to prevent splitting to supply demand for smaller " \ 1653 "blocks") \ 1654 range(0.0, DBL_MAX) \ 1655 \ 1656 product(bool, CMSExtrapolateSweep, false, \ 1657 "CMS: cushion for block demand during sweep") \ 1658 \ 1659 product(uintx, CMS_SweepWeight, 75, \ 1660 "Percentage (0-100) used to weight the current sample when " \ 1661 "computing exponentially decaying average for inter-sweep " \ 1662 "duration") \ 1663 range(0, 100) \ 1664 \ 1665 product(uintx, CMS_SweepPadding, 1, \ 1666 "The multiple of deviation from mean to use for buffering " \ 1667 "against volatility in inter-sweep duration") \ 1668 range(0, max_juint) \ 1669 \ 1670 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1671 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1672 "duration exceeds this threshold in milliseconds") \ 1673 range(0, max_uintx) \ 1674 \ 1675 product(bool, CMSClassUnloadingEnabled, true, \ 1676 "Whether class unloading enabled when using CMS GC") \ 1677 \ 1678 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1679 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1680 "count for which classes may not be unloaded") \ 1681 range(0, max_uintx) \ 1682 \ 1683 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1684 "Replenish an indexed free list with this number of chunks") \ 1685 range(1, max_uintx) \ 1686 \ 1687 product(bool, CMSReplenishIntermediate, true, \ 1688 "Replenish all intermediate free-list caches") \ 1689 \ 1690 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1691 "When satisfying batched demand, split blocks from the " \ 1692 "IndexedFreeList whose size is a multiple of requested size") \ 1693 \ 1694 product(bool, CMSLoopWarn, false, \ 1695 "Warn in case of excessive CMS looping") \ 1696 \ 1697 /* where does the range max value of (max_jint - 1) come from? */ \ 1698 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1699 "Maximum size of marking stack") \ 1700 range(1, (max_jint - 1)) \ 1701 \ 1702 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1703 "Size of marking stack") \ 1704 constraint(MarkStackSizeConstraintFunc,AfterErgo) \ 1705 \ 1706 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1707 "Simulate frequent marking stack / work queue overflow") \ 1708 \ 1709 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1710 "An \"interval\" counter that determines how frequently " \ 1711 "to simulate overflow; a smaller number increases frequency") \ 1712 \ 1713 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1714 "Maximum number of abortable preclean iterations, if > 0") \ 1715 range(0, max_uintx) \ 1716 \ 1717 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1718 "Maximum time in abortable preclean (in milliseconds)") \ 1719 range(0, max_intx) \ 1720 \ 1721 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1722 "Nominal minimum work per abortable preclean iteration") \ 1723 range(0, max_uintx) \ 1724 \ 1725 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1726 "Time that we sleep between iterations when not given " \ 1727 "enough work per iteration") \ 1728 range(0, max_intx) \ 1729 \ 1730 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \ 1731 product(size_t, CMSRescanMultiple, 32, \ 1732 "Size (in cards) of CMS parallel rescan task") \ 1733 range(1, SIZE_MAX / 4096) \ 1734 constraint(CMSRescanMultipleConstraintFunc,AfterMemoryInit) \ 1735 \ 1736 /* 4096 = CardTable::card_size_in_words * BitsPerWord */ \ 1737 product(size_t, CMSConcMarkMultiple, 32, \ 1738 "Size (in cards) of CMS concurrent MT marking task") \ 1739 range(1, SIZE_MAX / 4096) \ 1740 constraint(CMSConcMarkMultipleConstraintFunc,AfterMemoryInit) \ 1741 \ 1742 product(bool, CMSAbortSemantics, false, \ 1743 "Whether abort-on-overflow semantics is implemented") \ 1744 \ 1745 product(bool, CMSParallelInitialMarkEnabled, true, \ 1746 "Use the parallel initial mark.") \ 1747 \ 1748 product(bool, CMSParallelRemarkEnabled, true, \ 1749 "Whether parallel remark enabled (only if ParNewGC)") \ 1750 \ 1751 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1752 "Whether parallel remark of survivor space " \ 1753 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1754 \ 1755 product(bool, CMSPLABRecordAlways, true, \ 1756 "Always record survivor space PLAB boundaries (effective only " \ 1757 "if CMSParallelSurvivorRemarkEnabled)") \ 1758 \ 1759 product(bool, CMSEdenChunksRecordAlways, true, \ 1760 "Always record eden chunks used for the parallel initial mark " \ 1761 "or remark of eden") \ 1762 \ 1763 product(bool, CMSConcurrentMTEnabled, true, \ 1764 "Whether multi-threaded concurrent work enabled " \ 1765 "(effective only if ParNewGC)") \ 1766 \ 1767 product(bool, CMSPrecleaningEnabled, true, \ 1768 "Whether concurrent precleaning enabled") \ 1769 \ 1770 product(uintx, CMSPrecleanIter, 3, \ 1771 "Maximum number of precleaning iteration passes") \ 1772 range(0, 9) \ 1773 \ 1774 product(uintx, CMSPrecleanDenominator, 3, \ 1775 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1776 "ratio") \ 1777 range(1, max_uintx) \ 1778 constraint(CMSPrecleanDenominatorConstraintFunc,AfterErgo) \ 1779 \ 1780 product(uintx, CMSPrecleanNumerator, 2, \ 1781 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1782 "ratio") \ 1783 range(0, max_uintx-1) \ 1784 constraint(CMSPrecleanNumeratorConstraintFunc,AfterErgo) \ 1785 \ 1786 product(bool, CMSPrecleanRefLists1, true, \ 1787 "Preclean ref lists during (initial) preclean phase") \ 1788 \ 1789 product(bool, CMSPrecleanRefLists2, false, \ 1790 "Preclean ref lists during abortable preclean phase") \ 1791 \ 1792 product(bool, CMSPrecleanSurvivors1, false, \ 1793 "Preclean survivors during (initial) preclean phase") \ 1794 \ 1795 product(bool, CMSPrecleanSurvivors2, true, \ 1796 "Preclean survivors during abortable preclean phase") \ 1797 \ 1798 product(uintx, CMSPrecleanThreshold, 1000, \ 1799 "Do not iterate again if number of dirty cards is less than this")\ 1800 range(100, max_uintx) \ 1801 \ 1802 product(bool, CMSCleanOnEnter, true, \ 1803 "Clean-on-enter optimization for reducing number of dirty cards") \ 1804 \ 1805 product(uintx, CMSRemarkVerifyVariant, 1, \ 1806 "Choose variant (1,2) of verification following remark") \ 1807 range(1, 2) \ 1808 \ 1809 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1810 "If Eden size is below this, do not try to schedule remark") \ 1811 range(0, max_uintx) \ 1812 \ 1813 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1814 "The Eden occupancy percentage (0-100) at which " \ 1815 "to try and schedule remark pause") \ 1816 range(0, 100) \ 1817 \ 1818 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1819 "Start sampling eden top at least before young gen " \ 1820 "occupancy reaches 1/<ratio> of the size at which " \ 1821 "we plan to schedule remark") \ 1822 range(1, max_uintx) \ 1823 \ 1824 product(uintx, CMSSamplingGrain, 16*K, \ 1825 "The minimum distance between eden samples for CMS (see above)") \ 1826 range(ObjectAlignmentInBytes, max_uintx) \ 1827 constraint(CMSSamplingGrainConstraintFunc,AfterMemoryInit) \ 1828 \ 1829 product(bool, CMSScavengeBeforeRemark, false, \ 1830 "Attempt scavenge before the CMS remark step") \ 1831 \ 1832 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1833 "Don't drain below this size per parallel worker/thief") \ 1834 range(1, max_juint) \ 1835 constraint(CMSWorkQueueDrainThresholdConstraintFunc,AfterErgo) \ 1836 \ 1837 manageable(intx, CMSWaitDuration, 2000, \ 1838 "Time in milliseconds that CMS thread waits for young GC") \ 1839 range(min_jint, max_jint) \ 1840 \ 1841 develop(uintx, CMSCheckInterval, 1000, \ 1842 "Interval in milliseconds that CMS thread checks if it " \ 1843 "should start a collection cycle") \ 1844 \ 1845 product(bool, CMSYield, true, \ 1846 "Yield between steps of CMS") \ 1847 \ 1848 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1849 "Bitmap operations should process at most this many bits " \ 1850 "between yields") \ 1851 range(1, max_uintx) \ 1852 constraint(CMSBitMapYieldQuantumConstraintFunc,AfterMemoryInit) \ 1853 \ 1854 product(bool, CMSPrintChunksInDump, false, \ 1855 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1856 "trace level include more detailed information about the" \ 1857 "free chunks") \ 1858 \ 1859 product(bool, CMSPrintObjectsInDump, false, \ 1860 "If logging for the \"gc\" and \"promotion\" tags is enabled on" \ 1861 "trace level include more detailed information about the" \ 1862 "allocated objects") \ 1863 \ 1864 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1865 "Verify that all references across the FLS boundary " \ 1866 "are to valid objects") \ 1867 \ 1868 diagnostic(bool, FLSVerifyLists, false, \ 1869 "Do lots of (expensive) FreeListSpace verification") \ 1870 \ 1871 diagnostic(bool, FLSVerifyIndexTable, false, \ 1872 "Do lots of (expensive) FLS index table verification") \ 1873 \ 1874 develop(bool, FLSVerifyDictionary, false, \ 1875 "Do lots of (expensive) FLS dictionary verification") \ 1876 \ 1877 develop(bool, VerifyBlockOffsetArray, false, \ 1878 "Do (expensive) block offset array verification") \ 1879 \ 1880 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1881 "Maintain _unallocated_block in BlockOffsetArray " \ 1882 "(currently applicable only to CMS collector)") \ 1883 \ 1884 product(intx, RefDiscoveryPolicy, 0, \ 1885 "Select type of reference discovery policy: " \ 1886 "reference-based(0) or referent-based(1)") \ 1887 range(ReferenceProcessor::DiscoveryPolicyMin, \ 1888 ReferenceProcessor::DiscoveryPolicyMax) \ 1889 \ 1890 product(bool, ParallelRefProcEnabled, false, \ 1891 "Enable parallel reference processing whenever possible") \ 1892 \ 1893 product(bool, ParallelRefProcBalancingEnabled, true, \ 1894 "Enable balancing of reference processing queues") \ 1895 \ 1896 product(uintx, CMSTriggerRatio, 80, \ 1897 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1898 "allocated before a CMS collection cycle commences") \ 1899 range(0, 100) \ 1900 \ 1901 product(uintx, CMSBootstrapOccupancy, 50, \ 1902 "Percentage CMS generation occupancy at which to " \ 1903 "initiate CMS collection for bootstrapping collection stats") \ 1904 range(0, 100) \ 1905 \ 1906 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1907 "Percentage CMS generation occupancy to start a CMS collection " \ 1908 "cycle. A negative value means that CMSTriggerRatio is used") \ 1909 range(min_intx, 100) \ 1910 \ 1911 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1912 "The percent occupancy (IHOP) of the current old generation " \ 1913 "capacity above which a concurrent mark cycle will be initiated " \ 1914 "Its value may change over time if adaptive IHOP is enabled, " \ 1915 "otherwise the value remains constant. " \ 1916 "In the latter case a value of 0 will result as frequent as " \ 1917 "possible concurrent marking cycles. A value of 100 disables " \ 1918 "concurrent marking. " \ 1919 "Fragmentation waste in the old generation is not considered " \ 1920 "free space in this calculation. (G1 collector only)") \ 1921 range(0, 100) \ 1922 \ 1923 manageable(intx, CMSTriggerInterval, -1, \ 1924 "Commence a CMS collection cycle (at least) every so many " \ 1925 "milliseconds (0 permanently, -1 disabled)") \ 1926 range(-1, max_intx) \ 1927 \ 1928 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1929 "Only use occupancy as a criterion for starting a CMS collection")\ 1930 \ 1931 product(uintx, CMSIsTooFullPercentage, 98, \ 1932 "An absolute ceiling above which CMS will always consider the " \ 1933 "unloading of classes when class unloading is enabled") \ 1934 range(0, 100) \ 1935 \ 1936 develop(bool, CMSTestInFreeList, false, \ 1937 "Check if the coalesced range is already in the " \ 1938 "free lists as claimed") \ 1939 \ 1940 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1941 "Check that all the garbage collected was returned to the " \ 1942 "free lists") \ 1943 \ 1944 notproduct(bool, ScavengeALot, false, \ 1945 "Force scavenge at every Nth exit from the runtime system " \ 1946 "(N=ScavengeALotInterval)") \ 1947 \ 1948 develop(bool, FullGCALot, false, \ 1949 "Force full gc at every Nth exit from the runtime system " \ 1950 "(N=FullGCALotInterval)") \ 1951 \ 1952 notproduct(bool, GCALotAtAllSafepoints, false, \ 1953 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1954 \ 1955 notproduct(bool, PromotionFailureALot, false, \ 1956 "Use promotion failure handling on every youngest generation " \ 1957 "collection") \ 1958 \ 1959 develop(uintx, PromotionFailureALotCount, 1000, \ 1960 "Number of promotion failures occurring at PLAB " \ 1961 "refill attempts (ParNew) or promotion attempts " \ 1962 "(other young collectors)") \ 1963 \ 1964 develop(uintx, PromotionFailureALotInterval, 5, \ 1965 "Total collections between promotion failures a lot") \ 1966 \ 1967 experimental(uintx, WorkStealingSleepMillis, 1, \ 1968 "Sleep time when sleep is used for yields") \ 1969 \ 1970 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1971 "Number of yields before a sleep is done during work stealing") \ 1972 \ 1973 experimental(uintx, WorkStealingHardSpins, 4096, \ 1974 "Number of iterations in a spin loop between checks on " \ 1975 "time out of hard spin") \ 1976 \ 1977 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1978 "Ratio of hard spins to calls to yield") \ 1979 \ 1980 develop(uintx, ObjArrayMarkingStride, 2048, \ 1981 "Number of object array elements to push onto the marking stack " \ 1982 "before pushing a continuation entry") \ 1983 \ 1984 develop(bool, MetadataAllocationFailALot, false, \ 1985 "Fail metadata allocations at intervals controlled by " \ 1986 "MetadataAllocationFailALotInterval") \ 1987 \ 1988 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1989 "Metadata allocation failure a lot interval") \ 1990 \ 1991 notproduct(bool, ExecuteInternalVMTests, false, \ 1992 "Enable execution of internal VM tests") \ 1993 \ 1994 notproduct(bool, VerboseInternalVMTests, false, \ 1995 "Turn on logging for internal VM tests.") \ 1996 \ 1997 product(bool, ExecutingUnitTests, false, \ 1998 "Whether the JVM is running unit tests or not") \ 1999 \ 2000 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2001 \ 2002 product_pd(bool, ResizeTLAB, \ 2003 "Dynamically resize TLAB size for threads") \ 2004 \ 2005 product(bool, ZeroTLAB, false, \ 2006 "Zero out the newly created TLAB") \ 2007 \ 2008 product(bool, TLABStats, true, \ 2009 "Provide more detailed and expensive TLAB statistics.") \ 2010 \ 2011 product_pd(bool, NeverActAsServerClassMachine, \ 2012 "Never act like a server-class machine") \ 2013 \ 2014 product(bool, AlwaysActAsServerClassMachine, false, \ 2015 "Always act like a server-class machine") \ 2016 \ 2017 product_pd(uint64_t, MaxRAM, \ 2018 "Real memory size (in bytes) used to set maximum heap size") \ 2019 range(0, 0XFFFFFFFFFFFFFFFF) \ 2020 \ 2021 product(bool, AggressiveHeap, false, \ 2022 "Optimize heap options for long-running memory intensive apps") \ 2023 \ 2024 product(size_t, ErgoHeapSizeLimit, 0, \ 2025 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2026 "MaxRAM * MaxRAMPercentage / 100") \ 2027 range(0, max_uintx) \ 2028 \ 2029 product(uintx, MaxRAMFraction, 4, \ 2030 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2031 "size. " \ 2032 "Deprecated, use MaxRAMPercentage instead") \ 2033 range(1, max_uintx) \ 2034 \ 2035 product(uintx, MinRAMFraction, 2, \ 2036 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2037 "size on systems with small physical memory size. " \ 2038 "Deprecated, use MinRAMPercentage instead") \ 2039 range(1, max_uintx) \ 2040 \ 2041 product(uintx, InitialRAMFraction, 64, \ 2042 "Fraction (1/n) of real memory used for initial heap size. " \ 2043 "Deprecated, use InitialRAMPercentage instead") \ 2044 range(1, max_uintx) \ 2045 \ 2046 product(double, MaxRAMPercentage, 25.0, \ 2047 "Maximum percentage of real memory used for maximum heap size") \ 2048 range(0.0, 100.0) \ 2049 \ 2050 product(double, MinRAMPercentage, 50.0, \ 2051 "Minimum percentage of real memory used for maximum heap" \ 2052 "size on systems with small physical memory size") \ 2053 range(0.0, 100.0) \ 2054 \ 2055 product(double, InitialRAMPercentage, 1.5625, \ 2056 "Percentage of real memory used for initial heap size") \ 2057 range(0.0, 100.0) \ 2058 \ 2059 product(int, ActiveProcessorCount, -1, \ 2060 "Specify the CPU count the VM should use and report as active") \ 2061 \ 2062 develop(uintx, MaxVirtMemFraction, 2, \ 2063 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2064 "determining maximum heap size") \ 2065 \ 2066 product(bool, UseAdaptiveSizePolicy, true, \ 2067 "Use adaptive generation sizing policies") \ 2068 \ 2069 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2070 "Use adaptive survivor sizing policies") \ 2071 \ 2072 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2073 "Use adaptive young-old sizing policies at minor collections") \ 2074 \ 2075 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2076 "Use adaptive young-old sizing policies at major collections") \ 2077 \ 2078 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2079 "Include statistics from System.gc() for adaptive size policy") \ 2080 \ 2081 product(bool, UseAdaptiveGCBoundary, false, \ 2082 "Allow young-old boundary to move") \ 2083 \ 2084 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2085 "Resize the virtual spaces of the young or old generations") \ 2086 range(-1, 1) \ 2087 \ 2088 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2089 "Policy for changing generation size for throughput goals") \ 2090 range(0, 1) \ 2091 \ 2092 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2093 "Number of steps where heuristics is used before data is used") \ 2094 range(0, max_uintx) \ 2095 \ 2096 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2097 "Number of collections before the adaptive sizing is started") \ 2098 \ 2099 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2100 "Collection interval for printing information; zero means never") \ 2101 range(0, max_uintx) \ 2102 \ 2103 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2104 "Use adaptive minimum footprint as a goal") \ 2105 \ 2106 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2107 "Weight given to exponential resizing, between 0 and 100") \ 2108 range(0, 100) \ 2109 \ 2110 product(uintx, AdaptiveTimeWeight, 25, \ 2111 "Weight given to time in adaptive policy, between 0 and 100") \ 2112 range(0, 100) \ 2113 \ 2114 product(uintx, PausePadding, 1, \ 2115 "How much buffer to keep for pause time") \ 2116 range(0, max_juint) \ 2117 \ 2118 product(uintx, PromotedPadding, 3, \ 2119 "How much buffer to keep for promotion failure") \ 2120 range(0, max_juint) \ 2121 \ 2122 product(uintx, SurvivorPadding, 3, \ 2123 "How much buffer to keep for survivor overflow") \ 2124 range(0, max_juint) \ 2125 \ 2126 product(uintx, ThresholdTolerance, 10, \ 2127 "Allowed collection cost difference between generations") \ 2128 range(0, 100) \ 2129 \ 2130 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2131 "If collection costs are within margin, reduce both by full " \ 2132 "delta") \ 2133 range(0, 100) \ 2134 \ 2135 product(uintx, YoungGenerationSizeIncrement, 20, \ 2136 "Adaptive size percentage change in young generation") \ 2137 range(0, 100) \ 2138 \ 2139 product(uintx, YoungGenerationSizeSupplement, 80, \ 2140 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2141 range(0, 100) \ 2142 \ 2143 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2144 "Decay factor to YoungedGenerationSizeSupplement") \ 2145 range(1, max_uintx) \ 2146 \ 2147 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2148 "Adaptive size percentage change in tenured generation") \ 2149 range(0, 100) \ 2150 \ 2151 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2152 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2153 range(0, 100) \ 2154 \ 2155 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2156 "Decay factor to TenuredGenerationSizeIncrement") \ 2157 range(1, max_uintx) \ 2158 \ 2159 product(uintx, MaxGCPauseMillis, max_uintx - 1, \ 2160 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2161 "or (G1 Only) the maximum GC time per MMU time slice") \ 2162 range(1, max_uintx - 1) \ 2163 constraint(MaxGCPauseMillisConstraintFunc,AfterErgo) \ 2164 \ 2165 product(uintx, GCPauseIntervalMillis, 0, \ 2166 "Time slice for MMU specification") \ 2167 constraint(GCPauseIntervalMillisConstraintFunc,AfterErgo) \ 2168 \ 2169 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2170 "Adaptive size policy maximum GC minor pause time goal " \ 2171 "in millisecond") \ 2172 range(0, max_uintx) \ 2173 \ 2174 product(uintx, GCTimeRatio, 99, \ 2175 "Adaptive size policy application time to GC time ratio") \ 2176 range(0, max_juint) \ 2177 \ 2178 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2179 "Adaptive size scale down factor for shrinking") \ 2180 range(1, max_uintx) \ 2181 \ 2182 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2183 "Adaptive size decays the major cost for long major intervals") \ 2184 \ 2185 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2186 "Time scale over which major costs decay") \ 2187 range(0, max_uintx) \ 2188 \ 2189 product(uintx, MinSurvivorRatio, 3, \ 2190 "Minimum ratio of young generation/survivor space size") \ 2191 range(3, max_uintx) \ 2192 \ 2193 product(uintx, InitialSurvivorRatio, 8, \ 2194 "Initial ratio of young generation/survivor space size") \ 2195 range(0, max_uintx) \ 2196 \ 2197 product(size_t, BaseFootPrintEstimate, 256*M, \ 2198 "Estimate of footprint other than Java Heap") \ 2199 range(0, max_uintx) \ 2200 \ 2201 product(bool, UseGCOverheadLimit, true, \ 2202 "Use policy to limit of proportion of time spent in GC " \ 2203 "before an OutOfMemory error is thrown") \ 2204 \ 2205 product(uintx, GCTimeLimit, 98, \ 2206 "Limit of the proportion of time spent in GC before " \ 2207 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2208 range(0, 100) \ 2209 \ 2210 product(uintx, GCHeapFreeLimit, 2, \ 2211 "Minimum percentage of free space after a full GC before an " \ 2212 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2213 range(0, 100) \ 2214 \ 2215 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2216 "Number of consecutive collections before gc time limit fires") \ 2217 range(1, max_uintx) \ 2218 \ 2219 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2220 "How far ahead to prefetch destination area (<= 0 means off)") \ 2221 range(-1, max_jint) \ 2222 \ 2223 product(intx, PrefetchScanIntervalInBytes, -1, \ 2224 "How far ahead to prefetch scan area (<= 0 means off)") \ 2225 range(-1, max_jint) \ 2226 \ 2227 product(intx, PrefetchFieldsAhead, -1, \ 2228 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2229 range(-1, max_jint) \ 2230 \ 2231 diagnostic(bool, VerifyDuringStartup, false, \ 2232 "Verify memory system before executing any Java code " \ 2233 "during VM initialization") \ 2234 \ 2235 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2236 "Verify system before exiting") \ 2237 \ 2238 diagnostic(bool, VerifyBeforeGC, false, \ 2239 "Verify memory system before GC") \ 2240 \ 2241 diagnostic(bool, VerifyAfterGC, false, \ 2242 "Verify memory system after GC") \ 2243 \ 2244 diagnostic(bool, VerifyDuringGC, false, \ 2245 "Verify memory system during GC (between phases)") \ 2246 \ 2247 diagnostic(ccstrlist, VerifyGCType, "", \ 2248 "GC type(s) to verify when Verify*GC is enabled." \ 2249 "Available types are collector specific.") \ 2250 \ 2251 diagnostic(ccstrlist, VerifySubSet, "", \ 2252 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2253 "are enabled. One or more sub-systems can be specified " \ 2254 "in a comma separated string. Sub-systems are: " \ 2255 "threads, heap, symbol_table, string_table, codecache, " \ 2256 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2257 "codecache_oops") \ 2258 \ 2259 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2260 "Enable parallel memory system verification") \ 2261 \ 2262 diagnostic(bool, DeferInitialCardMark, false, \ 2263 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2264 "may arise from new_pre_store_barrier") \ 2265 \ 2266 product(bool, UseCondCardMark, false, \ 2267 "Check for already marked card before updating card table") \ 2268 \ 2269 diagnostic(bool, VerifyRememberedSets, false, \ 2270 "Verify GC remembered sets") \ 2271 \ 2272 diagnostic(bool, VerifyObjectStartArray, true, \ 2273 "Verify GC object start array if verify before/after") \ 2274 \ 2275 product(bool, DisableExplicitGC, false, \ 2276 "Ignore calls to System.gc()") \ 2277 \ 2278 notproduct(bool, CheckMemoryInitialization, false, \ 2279 "Check memory initialization") \ 2280 \ 2281 diagnostic(bool, BindCMSThreadToCPU, false, \ 2282 "Bind CMS Thread to CPU if possible") \ 2283 \ 2284 diagnostic(uintx, CPUForCMSThread, 0, \ 2285 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2286 range(0, max_juint) \ 2287 \ 2288 product(bool, BindGCTaskThreadsToCPUs, false, \ 2289 "Bind GCTaskThreads to CPUs if possible") \ 2290 \ 2291 product(bool, UseGCTaskAffinity, false, \ 2292 "Use worker affinity when asking for GCTasks") \ 2293 \ 2294 product(uintx, ProcessDistributionStride, 4, \ 2295 "Stride through processors when distributing processes") \ 2296 range(0, max_juint) \ 2297 \ 2298 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2299 "Number of times the coordinator GC thread will sleep while " \ 2300 "yielding before giving up and resuming GC") \ 2301 range(0, max_juint) \ 2302 \ 2303 product(uintx, CMSYieldSleepCount, 0, \ 2304 "Number of times a GC thread (minus the coordinator) " \ 2305 "will sleep while yielding before giving up and resuming GC") \ 2306 range(0, max_juint) \ 2307 \ 2308 product(bool, PrintGC, false, \ 2309 "Print message at garbage collection. " \ 2310 "Deprecated, use -Xlog:gc instead.") \ 2311 \ 2312 product(bool, PrintGCDetails, false, \ 2313 "Print more details at garbage collection. " \ 2314 "Deprecated, use -Xlog:gc* instead.") \ 2315 \ 2316 develop(intx, ConcGCYieldTimeout, 0, \ 2317 "If non-zero, assert that GC threads yield within this " \ 2318 "number of milliseconds") \ 2319 range(0, max_intx) \ 2320 \ 2321 develop(bool, TraceFinalizerRegistration, false, \ 2322 "Trace registration of final references") \ 2323 \ 2324 notproduct(bool, TraceScavenge, false, \ 2325 "Trace scavenge") \ 2326 \ 2327 product(bool, IgnoreEmptyClassPaths, false, \ 2328 "Ignore empty path elements in -classpath") \ 2329 \ 2330 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2331 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2332 "Initial size of the boot class loader data metaspace") \ 2333 range(30*K, max_uintx/BytesPerWord) \ 2334 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 2335 \ 2336 product(bool, PrintHeapAtSIGBREAK, true, \ 2337 "Print heap layout in response to SIGBREAK") \ 2338 \ 2339 manageable(bool, PrintClassHistogram, false, \ 2340 "Print a histogram of class instances") \ 2341 \ 2342 develop(bool, TraceGCTaskManager, false, \ 2343 "Trace actions of the GC task manager") \ 2344 \ 2345 develop(bool, TraceGCTaskQueue, false, \ 2346 "Trace actions of the GC task queues") \ 2347 \ 2348 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2349 "Trace marking phase in ParallelOldGC") \ 2350 \ 2351 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2352 "Trace dense prefix computation for ParallelOldGC") \ 2353 \ 2354 develop(bool, IgnoreLibthreadGPFault, false, \ 2355 "Suppress workaround for libthread GP fault") \ 2356 \ 2357 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2358 "The percentage of the used heap that the instances of a class " \ 2359 "must occupy for the class to generate a trace event") \ 2360 range(0.0, 100.0) \ 2361 \ 2362 /* JVMTI heap profiling */ \ 2363 \ 2364 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2365 "Trace JVMTI object tagging calls") \ 2366 \ 2367 diagnostic(bool, VerifyBeforeIteration, false, \ 2368 "Verify memory system before JVMTI iteration") \ 2369 \ 2370 /* compiler interface */ \ 2371 \ 2372 develop(bool, CIPrintCompilerName, false, \ 2373 "when CIPrint is active, print the name of the active compiler") \ 2374 \ 2375 diagnostic(bool, CIPrintCompileQueue, false, \ 2376 "display the contents of the compile queue whenever a " \ 2377 "compilation is enqueued") \ 2378 \ 2379 develop(bool, CIPrintRequests, false, \ 2380 "display every request for compilation") \ 2381 \ 2382 product(bool, CITime, false, \ 2383 "collect timing information for compilation") \ 2384 \ 2385 develop(bool, CITimeVerbose, false, \ 2386 "be more verbose in compilation timings") \ 2387 \ 2388 develop(bool, CITimeEach, false, \ 2389 "display timing information after each successful compilation") \ 2390 \ 2391 develop(bool, CICountOSR, false, \ 2392 "use a separate counter when assigning ids to osr compilations") \ 2393 \ 2394 develop(bool, CICompileNatives, true, \ 2395 "compile native methods if supported by the compiler") \ 2396 \ 2397 develop_pd(bool, CICompileOSR, \ 2398 "compile on stack replacement methods if supported by the " \ 2399 "compiler") \ 2400 \ 2401 develop(bool, CIPrintMethodCodes, false, \ 2402 "print method bytecodes of the compiled code") \ 2403 \ 2404 develop(bool, CIPrintTypeFlow, false, \ 2405 "print the results of ciTypeFlow analysis") \ 2406 \ 2407 develop(bool, CITraceTypeFlow, false, \ 2408 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2409 \ 2410 develop(intx, OSROnlyBCI, -1, \ 2411 "OSR only at this bci. Negative values mean exclude that bci") \ 2412 \ 2413 /* compiler */ \ 2414 \ 2415 /* notice: the max range value here is max_jint, not max_intx */ \ 2416 /* because of overflow issue */ \ 2417 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2418 "Number of compiler threads to run") \ 2419 range(0, max_jint) \ 2420 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 2421 \ 2422 product(intx, CompilationPolicyChoice, 0, \ 2423 "which compilation policy (0-3)") \ 2424 range(0, 3) \ 2425 \ 2426 develop(bool, UseStackBanging, true, \ 2427 "use stack banging for stack overflow checks (required for " \ 2428 "proper StackOverflow handling; disable only to measure cost " \ 2429 "of stackbanging)") \ 2430 \ 2431 develop(bool, UseStrictFP, true, \ 2432 "use strict fp if modifier strictfp is set") \ 2433 \ 2434 develop(bool, GenerateSynchronizationCode, true, \ 2435 "generate locking/unlocking code for synchronized methods and " \ 2436 "monitors") \ 2437 \ 2438 develop(bool, GenerateRangeChecks, true, \ 2439 "Generate range checks for array accesses") \ 2440 \ 2441 diagnostic_pd(bool, ImplicitNullChecks, \ 2442 "Generate code for implicit null checks") \ 2443 \ 2444 product_pd(bool, TrapBasedNullChecks, \ 2445 "Generate code for null checks that uses a cmp and trap " \ 2446 "instruction raising SIGTRAP. This is only used if an access to" \ 2447 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2448 "ImplicitNullChecks don't work (PPC64).") \ 2449 \ 2450 product(bool, PrintSafepointStatistics, false, \ 2451 "(Deprecated) Print statistics about safepoint synchronization") \ 2452 \ 2453 product(intx, PrintSafepointStatisticsCount, 300, \ 2454 "(Deprecated) Total number of safepoint statistics collected " \ 2455 "before printing them out") \ 2456 range(1, max_intx) \ 2457 \ 2458 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2459 "(Deprecated) Print safepoint statistics only when safepoint takes " \ 2460 "more than PrintSafepointSatisticsTimeout in millis") \ 2461 LP64_ONLY(range(-1, max_intx/MICROUNITS)) \ 2462 NOT_LP64(range(-1, max_intx)) \ 2463 \ 2464 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 2465 "Enable Thread SMR extra validity checks") \ 2466 \ 2467 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 2468 "Enable Thread SMR Statistics") \ 2469 \ 2470 product(bool, Inline, true, \ 2471 "Enable inlining") \ 2472 \ 2473 product(bool, ClipInlining, true, \ 2474 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2475 \ 2476 develop(bool, UseCHA, true, \ 2477 "Enable CHA") \ 2478 \ 2479 product(bool, UseTypeProfile, true, \ 2480 "Check interpreter profile for historically monomorphic calls") \ 2481 \ 2482 diagnostic(bool, PrintInlining, false, \ 2483 "Print inlining optimizations") \ 2484 \ 2485 product(bool, UsePopCountInstruction, false, \ 2486 "Use population count instruction") \ 2487 \ 2488 develop(bool, EagerInitialization, false, \ 2489 "Eagerly initialize classes if possible") \ 2490 \ 2491 diagnostic(bool, LogTouchedMethods, false, \ 2492 "Log methods which have been ever touched in runtime") \ 2493 \ 2494 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 2495 "Print all methods that have been ever touched in runtime") \ 2496 \ 2497 develop(bool, TraceMethodReplacement, false, \ 2498 "Print when methods are replaced do to recompilation") \ 2499 \ 2500 develop(bool, PrintMethodFlushing, false, \ 2501 "Print the nmethods being flushed") \ 2502 \ 2503 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2504 "print statistics about method flushing") \ 2505 \ 2506 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2507 "Number of compiled code invocations after which " \ 2508 "the method is considered as hot by the flusher") \ 2509 range(1, max_jint) \ 2510 \ 2511 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2512 "Minimum number of sweeper passes before an nmethod " \ 2513 "can be flushed") \ 2514 range(0, max_intx) \ 2515 \ 2516 product(bool, UseCodeAging, true, \ 2517 "Insert counter to detect warm methods") \ 2518 \ 2519 diagnostic(bool, StressCodeAging, false, \ 2520 "Start with counters compiled in") \ 2521 \ 2522 develop(bool, StressCodeBuffers, false, \ 2523 "Exercise code buffer expansion and other rare state changes") \ 2524 \ 2525 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2526 "Generate extra debugging information for non-safepoints in " \ 2527 "nmethods") \ 2528 \ 2529 product(bool, PrintVMOptions, false, \ 2530 "Print flags that appeared on the command line") \ 2531 \ 2532 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2533 "Ignore unrecognized VM options") \ 2534 \ 2535 product(bool, PrintCommandLineFlags, false, \ 2536 "Print flags specified on command line or set by ergonomics") \ 2537 \ 2538 product(bool, PrintFlagsInitial, false, \ 2539 "Print all VM flags before argument processing and exit VM") \ 2540 \ 2541 product(bool, PrintFlagsFinal, false, \ 2542 "Print all VM flags after argument and ergonomic processing") \ 2543 \ 2544 notproduct(bool, PrintFlagsWithComments, false, \ 2545 "Print all VM flags with default values and descriptions and " \ 2546 "exit") \ 2547 \ 2548 product(bool, PrintFlagsRanges, false, \ 2549 "Print VM flags and their ranges and exit VM") \ 2550 \ 2551 diagnostic(bool, SerializeVMOutput, true, \ 2552 "Use a mutex to serialize output to tty and LogFile") \ 2553 \ 2554 diagnostic(bool, DisplayVMOutput, true, \ 2555 "Display all VM output on the tty, independently of LogVMOutput") \ 2556 \ 2557 diagnostic(bool, LogVMOutput, false, \ 2558 "Save VM output to LogFile") \ 2559 \ 2560 diagnostic(ccstr, LogFile, NULL, \ 2561 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2562 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2563 \ 2564 product(ccstr, ErrorFile, NULL, \ 2565 "If an error occurs, save the error data to this file " \ 2566 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2567 \ 2568 product(bool, DisplayVMOutputToStderr, false, \ 2569 "If DisplayVMOutput is true, display all VM output to stderr") \ 2570 \ 2571 product(bool, DisplayVMOutputToStdout, false, \ 2572 "If DisplayVMOutput is true, display all VM output to stdout") \ 2573 \ 2574 product(bool, UseHeavyMonitors, false, \ 2575 "use heavyweight instead of lightweight Java monitors") \ 2576 \ 2577 product(bool, PrintStringTableStatistics, false, \ 2578 "print statistics about the StringTable and SymbolTable") \ 2579 \ 2580 diagnostic(bool, VerifyStringTableAtExit, false, \ 2581 "verify StringTable contents at exit") \ 2582 \ 2583 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2584 "print histogram of the symbol table") \ 2585 \ 2586 notproduct(bool, ExitVMOnVerifyError, false, \ 2587 "standard exit from VM if bytecode verify error " \ 2588 "(only in debug mode)") \ 2589 \ 2590 diagnostic(ccstr, AbortVMOnException, NULL, \ 2591 "Call fatal if this exception is thrown. Example: " \ 2592 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2593 \ 2594 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 2595 "Call fatal if the exception pointed by AbortVMOnException " \ 2596 "has this message") \ 2597 \ 2598 develop(bool, DebugVtables, false, \ 2599 "add debugging code to vtable dispatch") \ 2600 \ 2601 notproduct(bool, PrintVtableStats, false, \ 2602 "print vtables stats at end of run") \ 2603 \ 2604 develop(bool, TraceCreateZombies, false, \ 2605 "trace creation of zombie nmethods") \ 2606 \ 2607 notproduct(bool, IgnoreLockingAssertions, false, \ 2608 "disable locking assertions (for speed)") \ 2609 \ 2610 product(bool, RangeCheckElimination, true, \ 2611 "Eliminate range checks") \ 2612 \ 2613 develop_pd(bool, UncommonNullCast, \ 2614 "track occurrences of null in casts; adjust compiler tactics") \ 2615 \ 2616 develop(bool, TypeProfileCasts, true, \ 2617 "treat casts like calls for purposes of type profiling") \ 2618 \ 2619 develop(bool, DelayCompilationDuringStartup, true, \ 2620 "Delay invoking the compiler until main application class is " \ 2621 "loaded") \ 2622 \ 2623 develop(bool, CompileTheWorld, false, \ 2624 "Compile all methods in all classes in bootstrap class path " \ 2625 "(stress test)") \ 2626 \ 2627 develop(bool, CompileTheWorldPreloadClasses, true, \ 2628 "Preload all classes used by a class before start loading") \ 2629 \ 2630 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2631 "Force a safepoint every n compiles so sweeper can keep up") \ 2632 \ 2633 develop(bool, FillDelaySlots, true, \ 2634 "Fill delay slots (on SPARC only)") \ 2635 \ 2636 develop(bool, TimeLivenessAnalysis, false, \ 2637 "Time computation of bytecode liveness analysis") \ 2638 \ 2639 develop(bool, TraceLivenessGen, false, \ 2640 "Trace the generation of liveness analysis information") \ 2641 \ 2642 notproduct(bool, TraceLivenessQuery, false, \ 2643 "Trace queries of liveness analysis information") \ 2644 \ 2645 notproduct(bool, CollectIndexSetStatistics, false, \ 2646 "Collect information about IndexSets") \ 2647 \ 2648 develop(bool, UseLoopSafepoints, true, \ 2649 "Generate Safepoint nodes in every loop") \ 2650 \ 2651 develop(intx, FastAllocateSizeLimit, 128*K, \ 2652 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2653 "Inline allocations larger than this in doublewords must go slow")\ 2654 \ 2655 product(bool, AggressiveOpts, false, \ 2656 "(Deprecated) Enable aggressive optimizations - see arguments.cpp") \ 2657 \ 2658 product_pd(bool, CompactStrings, \ 2659 "Enable Strings to use single byte chars in backing store") \ 2660 \ 2661 product_pd(uintx, TypeProfileLevel, \ 2662 "=XYZ, with Z: Type profiling of arguments at call; " \ 2663 "Y: Type profiling of return value at call; " \ 2664 "X: Type profiling of parameters to methods; " \ 2665 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2666 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 2667 \ 2668 product(intx, TypeProfileArgsLimit, 2, \ 2669 "max number of call arguments to consider for type profiling") \ 2670 range(0, 16) \ 2671 \ 2672 product(intx, TypeProfileParmsLimit, 2, \ 2673 "max number of incoming parameters to consider for type profiling"\ 2674 ", -1 for all") \ 2675 range(-1, 64) \ 2676 \ 2677 /* statistics */ \ 2678 develop(bool, CountCompiledCalls, false, \ 2679 "Count method invocations") \ 2680 \ 2681 notproduct(bool, CountRuntimeCalls, false, \ 2682 "Count VM runtime calls") \ 2683 \ 2684 develop(bool, CountJNICalls, false, \ 2685 "Count jni method invocations") \ 2686 \ 2687 notproduct(bool, CountJVMCalls, false, \ 2688 "Count jvm method invocations") \ 2689 \ 2690 notproduct(bool, CountRemovableExceptions, false, \ 2691 "Count exceptions that could be replaced by branches due to " \ 2692 "inlining") \ 2693 \ 2694 notproduct(bool, ICMissHistogram, false, \ 2695 "Produce histogram of IC misses") \ 2696 \ 2697 /* interpreter */ \ 2698 product_pd(bool, RewriteBytecodes, \ 2699 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2700 \ 2701 product_pd(bool, RewriteFrequentPairs, \ 2702 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2703 \ 2704 diagnostic(bool, PrintInterpreter, false, \ 2705 "Print the generated interpreter code") \ 2706 \ 2707 product(bool, UseInterpreter, true, \ 2708 "Use interpreter for non-compiled methods") \ 2709 \ 2710 develop(bool, UseFastSignatureHandlers, true, \ 2711 "Use fast signature handlers for native calls") \ 2712 \ 2713 product(bool, UseLoopCounter, true, \ 2714 "Increment invocation counter on backward branch") \ 2715 \ 2716 product_pd(bool, UseOnStackReplacement, \ 2717 "Use on stack replacement, calls runtime if invoc. counter " \ 2718 "overflows in loop") \ 2719 \ 2720 notproduct(bool, TraceOnStackReplacement, false, \ 2721 "Trace on stack replacement") \ 2722 \ 2723 product_pd(bool, PreferInterpreterNativeStubs, \ 2724 "Use always interpreter stubs for native methods invoked via " \ 2725 "interpreter") \ 2726 \ 2727 develop(bool, CountBytecodes, false, \ 2728 "Count number of bytecodes executed") \ 2729 \ 2730 develop(bool, PrintBytecodeHistogram, false, \ 2731 "Print histogram of the executed bytecodes") \ 2732 \ 2733 develop(bool, PrintBytecodePairHistogram, false, \ 2734 "Print histogram of the executed bytecode pairs") \ 2735 \ 2736 diagnostic(bool, PrintSignatureHandlers, false, \ 2737 "Print code generated for native method signature handlers") \ 2738 \ 2739 develop(bool, VerifyOops, false, \ 2740 "Do plausibility checks for oops") \ 2741 \ 2742 develop(bool, CheckUnhandledOops, false, \ 2743 "Check for unhandled oops in VM code") \ 2744 \ 2745 develop(bool, VerifyJNIFields, trueInDebug, \ 2746 "Verify jfieldIDs for instance fields") \ 2747 \ 2748 notproduct(bool, VerifyJNIEnvThread, false, \ 2749 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2750 "from JNI") \ 2751 \ 2752 develop(bool, VerifyFPU, false, \ 2753 "Verify FPU state (check for NaN's, etc.)") \ 2754 \ 2755 develop(bool, VerifyThread, false, \ 2756 "Watch the thread register for corruption (SPARC only)") \ 2757 \ 2758 develop(bool, VerifyActivationFrameSize, false, \ 2759 "Verify that activation frame didn't become smaller than its " \ 2760 "minimal size") \ 2761 \ 2762 develop(bool, TraceFrequencyInlining, false, \ 2763 "Trace frequency based inlining") \ 2764 \ 2765 develop_pd(bool, InlineIntrinsics, \ 2766 "Inline intrinsics that can be statically resolved") \ 2767 \ 2768 product_pd(bool, ProfileInterpreter, \ 2769 "Profile at the bytecode level during interpretation") \ 2770 \ 2771 develop(bool, TraceProfileInterpreter, false, \ 2772 "Trace profiling at the bytecode level during interpretation. " \ 2773 "This outputs the profiling information collected to improve " \ 2774 "jit compilation.") \ 2775 \ 2776 develop_pd(bool, ProfileTraps, \ 2777 "Profile deoptimization traps at the bytecode level") \ 2778 \ 2779 product(intx, ProfileMaturityPercentage, 20, \ 2780 "number of method invocations/branches (expressed as % of " \ 2781 "CompileThreshold) before using the method's profile") \ 2782 range(0, 100) \ 2783 \ 2784 diagnostic(bool, PrintMethodData, false, \ 2785 "Print the results of +ProfileInterpreter at end of run") \ 2786 \ 2787 develop(bool, VerifyDataPointer, trueInDebug, \ 2788 "Verify the method data pointer during interpreter profiling") \ 2789 \ 2790 develop(bool, VerifyCompiledCode, false, \ 2791 "Include miscellaneous runtime verifications in nmethod code; " \ 2792 "default off because it disturbs nmethod size heuristics") \ 2793 \ 2794 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2795 "Manually make GC thread crash then dump java stack trace; " \ 2796 "Test only") \ 2797 \ 2798 /* compilation */ \ 2799 product(bool, UseCompiler, true, \ 2800 "Use Just-In-Time compilation") \ 2801 \ 2802 develop(bool, TraceCompilationPolicy, false, \ 2803 "Trace compilation policy") \ 2804 \ 2805 develop(bool, TimeCompilationPolicy, false, \ 2806 "Time the compilation policy") \ 2807 \ 2808 product(bool, UseCounterDecay, true, \ 2809 "Adjust recompilation counters") \ 2810 \ 2811 develop(intx, CounterHalfLifeTime, 30, \ 2812 "Half-life time of invocation counters (in seconds)") \ 2813 \ 2814 develop(intx, CounterDecayMinIntervalLength, 500, \ 2815 "The minimum interval (in milliseconds) between invocation of " \ 2816 "CounterDecay") \ 2817 \ 2818 product(bool, AlwaysCompileLoopMethods, false, \ 2819 "When using recompilation, never interpret methods " \ 2820 "containing loops") \ 2821 \ 2822 product(bool, DontCompileHugeMethods, true, \ 2823 "Do not compile methods > HugeMethodLimit") \ 2824 \ 2825 /* Bytecode escape analysis estimation. */ \ 2826 product(bool, EstimateArgEscape, true, \ 2827 "Analyze bytecodes to estimate escape state of arguments") \ 2828 \ 2829 product(intx, BCEATraceLevel, 0, \ 2830 "How much tracing to do of bytecode escape analysis estimates " \ 2831 "(0-3)") \ 2832 range(0, 3) \ 2833 \ 2834 product(intx, MaxBCEAEstimateLevel, 5, \ 2835 "Maximum number of nested calls that are analyzed by BC EA") \ 2836 range(0, max_jint) \ 2837 \ 2838 product(intx, MaxBCEAEstimateSize, 150, \ 2839 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2840 range(0, max_jint) \ 2841 \ 2842 product(intx, AllocatePrefetchStyle, 1, \ 2843 "0 = no prefetch, " \ 2844 "1 = generate prefetch instructions for each allocation, " \ 2845 "2 = use TLAB watermark to gate allocation prefetch, " \ 2846 "3 = generate one prefetch instruction per cache line") \ 2847 range(0, 3) \ 2848 \ 2849 product(intx, AllocatePrefetchDistance, -1, \ 2850 "Distance to prefetch ahead of allocation pointer. " \ 2851 "-1: use system-specific value (automatically determined") \ 2852 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 2853 \ 2854 product(intx, AllocatePrefetchLines, 3, \ 2855 "Number of lines to prefetch ahead of array allocation pointer") \ 2856 range(1, 64) \ 2857 \ 2858 product(intx, AllocateInstancePrefetchLines, 1, \ 2859 "Number of lines to prefetch ahead of instance allocation " \ 2860 "pointer") \ 2861 range(1, 64) \ 2862 \ 2863 product(intx, AllocatePrefetchStepSize, 16, \ 2864 "Step size in bytes of sequential prefetch instructions") \ 2865 range(1, 512) \ 2866 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 2867 \ 2868 product(intx, AllocatePrefetchInstr, 0, \ 2869 "Select instruction to prefetch ahead of allocation pointer") \ 2870 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 2871 \ 2872 /* deoptimization */ \ 2873 develop(bool, TraceDeoptimization, false, \ 2874 "Trace deoptimization") \ 2875 \ 2876 develop(bool, PrintDeoptimizationDetails, false, \ 2877 "Print more information about deoptimization") \ 2878 \ 2879 develop(bool, DebugDeoptimization, false, \ 2880 "Tracing various information while debugging deoptimization") \ 2881 \ 2882 product(intx, SelfDestructTimer, 0, \ 2883 "Will cause VM to terminate after a given time (in minutes) " \ 2884 "(0 means off)") \ 2885 range(0, max_intx) \ 2886 \ 2887 product(intx, MaxJavaStackTraceDepth, 1024, \ 2888 "The maximum number of lines in the stack trace for Java " \ 2889 "exceptions (0 means all)") \ 2890 range(0, max_jint/2) \ 2891 \ 2892 /* notice: the max range value here is max_jint, not max_intx */ \ 2893 /* because of overflow issue */ \ 2894 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2895 "Guarantee a safepoint (at least) every so many milliseconds " \ 2896 "(0 means none)") \ 2897 range(0, max_jint) \ 2898 \ 2899 product(intx, SafepointTimeoutDelay, 10000, \ 2900 "Delay in milliseconds for option SafepointTimeout") \ 2901 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 2902 NOT_LP64(range(0, max_intx)) \ 2903 \ 2904 product(intx, NmethodSweepActivity, 10, \ 2905 "Removes cold nmethods from code cache if > 0. Higher values " \ 2906 "result in more aggressive sweeping") \ 2907 range(0, 2000) \ 2908 \ 2909 notproduct(bool, LogSweeper, false, \ 2910 "Keep a ring buffer of sweeper activity") \ 2911 \ 2912 notproduct(intx, SweeperLogEntries, 1024, \ 2913 "Number of records in the ring buffer of sweeper activity") \ 2914 \ 2915 notproduct(intx, MemProfilingInterval, 500, \ 2916 "Time between each invocation of the MemProfiler") \ 2917 \ 2918 develop(intx, MallocCatchPtr, -1, \ 2919 "Hit breakpoint when mallocing/freeing this pointer") \ 2920 \ 2921 notproduct(ccstrlist, SuppressErrorAt, "", \ 2922 "List of assertions (file:line) to muzzle") \ 2923 \ 2924 develop(intx, StackPrintLimit, 100, \ 2925 "number of stack frames to print in VM-level stack dump") \ 2926 \ 2927 notproduct(intx, MaxElementPrintSize, 256, \ 2928 "maximum number of elements to print") \ 2929 \ 2930 notproduct(intx, MaxSubklassPrintSize, 4, \ 2931 "maximum number of subklasses to print when printing klass") \ 2932 \ 2933 product(intx, MaxInlineLevel, 9, \ 2934 "maximum number of nested calls that are inlined") \ 2935 range(0, max_jint) \ 2936 \ 2937 product(intx, MaxRecursiveInlineLevel, 1, \ 2938 "maximum number of nested recursive calls that are inlined") \ 2939 range(0, max_jint) \ 2940 \ 2941 develop(intx, MaxForceInlineLevel, 100, \ 2942 "maximum number of nested calls that are forced for inlining " \ 2943 "(using CompileCommand or marked w/ @ForceInline)") \ 2944 range(0, max_jint) \ 2945 \ 2946 product_pd(intx, InlineSmallCode, \ 2947 "Only inline already compiled methods if their code size is " \ 2948 "less than this") \ 2949 range(0, max_jint) \ 2950 \ 2951 product(intx, MaxInlineSize, 35, \ 2952 "The maximum bytecode size of a method to be inlined") \ 2953 range(0, max_jint) \ 2954 \ 2955 product_pd(intx, FreqInlineSize, \ 2956 "The maximum bytecode size of a frequent method to be inlined") \ 2957 range(0, max_jint) \ 2958 \ 2959 product(intx, MaxTrivialSize, 6, \ 2960 "The maximum bytecode size of a trivial method to be inlined") \ 2961 range(0, max_jint) \ 2962 \ 2963 product(intx, MinInliningThreshold, 250, \ 2964 "The minimum invocation count a method needs to have to be " \ 2965 "inlined") \ 2966 range(0, max_jint) \ 2967 \ 2968 develop(intx, MethodHistogramCutoff, 100, \ 2969 "The cutoff value for method invocation histogram (+CountCalls)") \ 2970 \ 2971 diagnostic(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2972 "Number of interpreted methods to show in profile") \ 2973 \ 2974 diagnostic(intx, ProfilerNumberOfCompiledMethods, 25, \ 2975 "Number of compiled methods to show in profile") \ 2976 \ 2977 diagnostic(intx, ProfilerNumberOfStubMethods, 25, \ 2978 "Number of stub methods to show in profile") \ 2979 \ 2980 diagnostic(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2981 "Number of runtime stub nodes to show in profile") \ 2982 \ 2983 product(intx, ProfileIntervalsTicks, 100, \ 2984 "Number of ticks between printing of interval profile " \ 2985 "(+ProfileIntervals)") \ 2986 range(0, max_intx) \ 2987 \ 2988 notproduct(intx, ScavengeALotInterval, 1, \ 2989 "Interval between which scavenge will occur with +ScavengeALot") \ 2990 \ 2991 notproduct(intx, FullGCALotInterval, 1, \ 2992 "Interval between which full gc will occur with +FullGCALot") \ 2993 \ 2994 notproduct(intx, FullGCALotStart, 0, \ 2995 "For which invocation to start FullGCAlot") \ 2996 \ 2997 notproduct(intx, FullGCALotDummies, 32*K, \ 2998 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2999 "to move") \ 3000 \ 3001 develop(intx, DontYieldALotInterval, 10, \ 3002 "Interval between which yields will be dropped (milliseconds)") \ 3003 \ 3004 develop(intx, ProfilerPCTickThreshold, 15, \ 3005 "Number of ticks in a PC buckets to be a hotspot") \ 3006 \ 3007 notproduct(intx, DeoptimizeALotInterval, 5, \ 3008 "Number of exits until DeoptimizeALot kicks in") \ 3009 \ 3010 notproduct(intx, ZombieALotInterval, 5, \ 3011 "Number of exits until ZombieALot kicks in") \ 3012 \ 3013 diagnostic(uintx, MallocMaxTestWords, 0, \ 3014 "If non-zero, maximum number of words that malloc/realloc can " \ 3015 "allocate (for testing only)") \ 3016 range(0, max_uintx) \ 3017 \ 3018 product(intx, TypeProfileWidth, 2, \ 3019 "Number of receiver types to record in call/cast profile") \ 3020 range(0, 8) \ 3021 \ 3022 develop(intx, BciProfileWidth, 2, \ 3023 "Number of return bci's to record in ret profile") \ 3024 \ 3025 product(intx, PerMethodRecompilationCutoff, 400, \ 3026 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3027 range(-1, max_intx) \ 3028 \ 3029 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3030 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3031 range(-1, max_intx) \ 3032 \ 3033 product(intx, PerMethodTrapLimit, 100, \ 3034 "Limit on traps (of one kind) in a method (includes inlines)") \ 3035 range(0, max_jint) \ 3036 \ 3037 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3038 "Limit on speculative traps (of one kind) in a method " \ 3039 "(includes inlines)") \ 3040 range(0, max_jint) \ 3041 \ 3042 product(intx, PerBytecodeTrapLimit, 4, \ 3043 "Limit on traps (of one kind) at a particular BCI") \ 3044 range(0, max_jint) \ 3045 \ 3046 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3047 "Extra method data trap entries for speculation") \ 3048 \ 3049 develop(intx, InlineFrequencyRatio, 20, \ 3050 "Ratio of call site execution to caller method invocation") \ 3051 range(0, max_jint) \ 3052 \ 3053 diagnostic_pd(intx, InlineFrequencyCount, \ 3054 "Count of call site execution necessary to trigger frequent " \ 3055 "inlining") \ 3056 range(0, max_jint) \ 3057 \ 3058 develop(intx, InlineThrowCount, 50, \ 3059 "Force inlining of interpreted methods that throw this often") \ 3060 range(0, max_jint) \ 3061 \ 3062 develop(intx, InlineThrowMaxSize, 200, \ 3063 "Force inlining of throwing methods smaller than this") \ 3064 range(0, max_jint) \ 3065 \ 3066 develop(intx, ProfilerNodeSize, 1024, \ 3067 "Size in K to allocate for the Profile Nodes of each thread") \ 3068 range(0, 1024) \ 3069 \ 3070 /* gc parameters */ \ 3071 product(size_t, InitialHeapSize, 0, \ 3072 "Initial heap size (in bytes); zero means use ergonomics") \ 3073 constraint(InitialHeapSizeConstraintFunc,AfterErgo) \ 3074 \ 3075 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3076 "Maximum heap size (in bytes)") \ 3077 constraint(MaxHeapSizeConstraintFunc,AfterErgo) \ 3078 \ 3079 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3080 "Initial tenured generation size (in bytes)") \ 3081 range(0, max_uintx) \ 3082 \ 3083 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3084 "Initial new generation size (in bytes)") \ 3085 constraint(NewSizeConstraintFunc,AfterErgo) \ 3086 \ 3087 product(size_t, MaxNewSize, max_uintx, \ 3088 "Maximum new generation size (in bytes), max_uintx means set " \ 3089 "ergonomically") \ 3090 range(0, max_uintx) \ 3091 \ 3092 product_pd(size_t, HeapBaseMinAddress, \ 3093 "OS specific low limit for heap base address") \ 3094 constraint(HeapBaseMinAddressConstraintFunc,AfterErgo) \ 3095 \ 3096 product(size_t, PretenureSizeThreshold, 0, \ 3097 "Maximum size in bytes of objects allocated in DefNew " \ 3098 "generation; zero means no maximum") \ 3099 range(0, max_uintx) \ 3100 \ 3101 product(size_t, MinTLABSize, 2*K, \ 3102 "Minimum allowed TLAB size (in bytes)") \ 3103 range(1, max_uintx/2) \ 3104 constraint(MinTLABSizeConstraintFunc,AfterMemoryInit) \ 3105 \ 3106 product(size_t, TLABSize, 0, \ 3107 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3108 constraint(TLABSizeConstraintFunc,AfterMemoryInit) \ 3109 \ 3110 product(size_t, YoungPLABSize, 4096, \ 3111 "Size of young gen promotion LAB's (in HeapWords)") \ 3112 constraint(YoungPLABSizeConstraintFunc,AfterMemoryInit) \ 3113 \ 3114 product(size_t, OldPLABSize, 1024, \ 3115 "Size of old gen promotion LAB's (in HeapWords), or Number " \ 3116 "of blocks to attempt to claim when refilling CMS LAB's") \ 3117 constraint(OldPLABSizeConstraintFunc,AfterMemoryInit) \ 3118 \ 3119 product(uintx, TLABAllocationWeight, 35, \ 3120 "Allocation averaging weight") \ 3121 range(0, 100) \ 3122 \ 3123 /* Limit the lower bound of this flag to 1 as it is used */ \ 3124 /* in a division expression. */ \ 3125 product(uintx, TLABWasteTargetPercent, 1, \ 3126 "Percentage of Eden that can be wasted") \ 3127 range(1, 100) \ 3128 \ 3129 product(uintx, TLABRefillWasteFraction, 64, \ 3130 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3131 range(1, max_juint) \ 3132 \ 3133 product(uintx, TLABWasteIncrement, 4, \ 3134 "Increment allowed waste at slow allocation") \ 3135 range(0, max_jint) \ 3136 constraint(TLABWasteIncrementConstraintFunc,AfterMemoryInit) \ 3137 \ 3138 product(uintx, SurvivorRatio, 8, \ 3139 "Ratio of eden/survivor space size") \ 3140 range(1, max_uintx-2) \ 3141 constraint(SurvivorRatioConstraintFunc,AfterMemoryInit) \ 3142 \ 3143 product(uintx, NewRatio, 2, \ 3144 "Ratio of old/new generation sizes") \ 3145 range(0, max_uintx-1) \ 3146 \ 3147 product_pd(size_t, NewSizeThreadIncrease, \ 3148 "Additional size added to desired new generation size per " \ 3149 "non-daemon thread (in bytes)") \ 3150 range(0, max_uintx) \ 3151 \ 3152 product_pd(size_t, MetaspaceSize, \ 3153 "Initial threshold (in bytes) at which a garbage collection " \ 3154 "is done to reduce Metaspace usage") \ 3155 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 3156 \ 3157 product(size_t, MaxMetaspaceSize, max_uintx, \ 3158 "Maximum size of Metaspaces (in bytes)") \ 3159 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 3160 \ 3161 product(size_t, CompressedClassSpaceSize, 1*G, \ 3162 "Maximum size of class area in Metaspace when compressed " \ 3163 "class pointers are used") \ 3164 range(1*M, 3*G) \ 3165 \ 3166 manageable(uintx, MinHeapFreeRatio, 40, \ 3167 "The minimum percentage of heap free after GC to avoid expansion."\ 3168 " For most GCs this applies to the old generation. In G1 and" \ 3169 " ParallelGC it applies to the whole heap.") \ 3170 range(0, 100) \ 3171 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 3172 \ 3173 manageable(uintx, MaxHeapFreeRatio, 70, \ 3174 "The maximum percentage of heap free after GC to avoid shrinking."\ 3175 " For most GCs this applies to the old generation. In G1 and" \ 3176 " ParallelGC it applies to the whole heap.") \ 3177 range(0, 100) \ 3178 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 3179 \ 3180 product(bool, ShrinkHeapInSteps, true, \ 3181 "When disabled, informs the GC to shrink the java heap directly" \ 3182 " to the target size at the next full GC rather than requiring" \ 3183 " smaller steps during multiple full GCs.") \ 3184 \ 3185 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3186 "Number of milliseconds per MB of free space in the heap") \ 3187 range(0, max_intx) \ 3188 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 3189 \ 3190 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3191 "The minimum change in heap space due to GC (in bytes)") \ 3192 range(0, max_uintx) \ 3193 \ 3194 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3195 "The minimum expansion of Metaspace (in bytes)") \ 3196 range(0, max_uintx) \ 3197 \ 3198 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3199 "The maximum percentage of Metaspace free after GC to avoid " \ 3200 "shrinking") \ 3201 range(0, 100) \ 3202 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3203 \ 3204 product(uintx, MinMetaspaceFreeRatio, 40, \ 3205 "The minimum percentage of Metaspace free after GC to avoid " \ 3206 "expansion") \ 3207 range(0, 99) \ 3208 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 3209 \ 3210 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3211 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3212 range(0, max_uintx) \ 3213 \ 3214 product(uintx, QueuedAllocationWarningCount, 0, \ 3215 "Number of times an allocation that queues behind a GC " \ 3216 "will retry before printing a warning") \ 3217 range(0, max_uintx) \ 3218 \ 3219 diagnostic(uintx, VerifyGCStartAt, 0, \ 3220 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3221 range(0, max_uintx) \ 3222 \ 3223 diagnostic(intx, VerifyGCLevel, 0, \ 3224 "Generation level at which to start +VerifyBefore/AfterGC") \ 3225 range(0, 1) \ 3226 \ 3227 product(uintx, MaxTenuringThreshold, 15, \ 3228 "Maximum value for tenuring threshold") \ 3229 range(0, markOopDesc::max_age + 1) \ 3230 constraint(MaxTenuringThresholdConstraintFunc,AfterErgo) \ 3231 \ 3232 product(uintx, InitialTenuringThreshold, 7, \ 3233 "Initial value for tenuring threshold") \ 3234 range(0, markOopDesc::max_age + 1) \ 3235 constraint(InitialTenuringThresholdConstraintFunc,AfterErgo) \ 3236 \ 3237 product(uintx, TargetSurvivorRatio, 50, \ 3238 "Desired percentage of survivor space used after scavenge") \ 3239 range(0, 100) \ 3240 \ 3241 product(uintx, MarkSweepDeadRatio, 5, \ 3242 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3243 "Serial mark sweep treats this as both the minimum and maximum " \ 3244 "value. " \ 3245 "CMS uses this value only if it falls back to mark sweep. " \ 3246 "Par compact uses a variable scale based on the density of the " \ 3247 "generation and treats this as the maximum value when the heap " \ 3248 "is either completely full or completely empty. Par compact " \ 3249 "also has a smaller default value; see arguments.cpp.") \ 3250 range(0, 100) \ 3251 \ 3252 product(uint, MarkSweepAlwaysCompactCount, 4, \ 3253 "How often should we fully compact the heap (ignoring the dead " \ 3254 "space parameters)") \ 3255 range(1, max_juint) \ 3256 \ 3257 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3258 "Delay between expansion and allocation (in milliseconds)") \ 3259 \ 3260 develop(uintx, GCWorkerDelayMillis, 0, \ 3261 "Delay in scheduling GC workers (in milliseconds)") \ 3262 \ 3263 product(bool, PSChunkLargeArrays, true, \ 3264 "Process large arrays in chunks") \ 3265 \ 3266 product(uintx, GCDrainStackTargetSize, 64, \ 3267 "Number of entries we will try to leave on the stack " \ 3268 "during parallel gc") \ 3269 range(0, max_juint) \ 3270 \ 3271 /* stack parameters */ \ 3272 product_pd(intx, StackYellowPages, \ 3273 "Number of yellow zone (recoverable overflows) pages of size " \ 3274 "4KB. If pages are bigger yellow zone is aligned up.") \ 3275 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 3276 \ 3277 product_pd(intx, StackRedPages, \ 3278 "Number of red zone (unrecoverable overflows) pages of size " \ 3279 "4KB. If pages are bigger red zone is aligned up.") \ 3280 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 3281 \ 3282 product_pd(intx, StackReservedPages, \ 3283 "Number of reserved zone (reserved to annotated methods) pages" \ 3284 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 3285 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 3286 \ 3287 product(bool, RestrictReservedStack, true, \ 3288 "Restrict @ReservedStackAccess to trusted classes") \ 3289 \ 3290 /* greater stack shadow pages can't generate instruction to bang stack */ \ 3291 product_pd(intx, StackShadowPages, \ 3292 "Number of shadow zone (for overflow checking) pages of size " \ 3293 "4KB. If pages are bigger shadow zone is aligned up. " \ 3294 "This should exceed the depth of the VM and native call stack.") \ 3295 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 3296 \ 3297 product_pd(intx, ThreadStackSize, \ 3298 "Thread Stack Size (in Kbytes)") \ 3299 range(0, 1 * M) \ 3300 \ 3301 product_pd(intx, VMThreadStackSize, \ 3302 "Non-Java Thread Stack Size (in Kbytes)") \ 3303 range(0, max_intx/(1 * K)) \ 3304 \ 3305 product_pd(intx, CompilerThreadStackSize, \ 3306 "Compiler Thread Stack Size (in Kbytes)") \ 3307 range(0, max_intx/(1 * K)) \ 3308 \ 3309 develop_pd(size_t, JVMInvokeMethodSlack, \ 3310 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3311 \ 3312 /* code cache parameters */ \ 3313 develop_pd(uintx, CodeCacheSegmentSize, \ 3314 "Code cache segment size (in bytes) - smallest unit of " \ 3315 "allocation") \ 3316 range(1, 1024) \ 3317 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 3318 \ 3319 develop_pd(intx, CodeEntryAlignment, \ 3320 "Code entry alignment for generated code (in bytes)") \ 3321 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 3322 \ 3323 product_pd(intx, OptoLoopAlignment, \ 3324 "Align inner loops to zero relative to this modulus") \ 3325 range(1, 16) \ 3326 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 3327 \ 3328 product_pd(uintx, InitialCodeCacheSize, \ 3329 "Initial code cache size (in bytes)") \ 3330 range(os::vm_page_size(), max_uintx) \ 3331 \ 3332 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3333 "Minimum code cache size (in bytes) required to start VM.") \ 3334 range(0, max_uintx) \ 3335 \ 3336 product(bool, SegmentedCodeCache, false, \ 3337 "Use a segmented code cache") \ 3338 \ 3339 product_pd(uintx, ReservedCodeCacheSize, \ 3340 "Reserved code cache size (in bytes) - maximum code cache size") \ 3341 range(os::vm_page_size(), max_uintx) \ 3342 \ 3343 product_pd(uintx, NonProfiledCodeHeapSize, \ 3344 "Size of code heap with non-profiled methods (in bytes)") \ 3345 range(0, max_uintx) \ 3346 \ 3347 product_pd(uintx, ProfiledCodeHeapSize, \ 3348 "Size of code heap with profiled methods (in bytes)") \ 3349 range(0, max_uintx) \ 3350 \ 3351 product_pd(uintx, NonNMethodCodeHeapSize, \ 3352 "Size of code heap with non-nmethods (in bytes)") \ 3353 range(os::vm_page_size(), max_uintx) \ 3354 \ 3355 product_pd(uintx, CodeCacheExpansionSize, \ 3356 "Code cache expansion size (in bytes)") \ 3357 range(32*K, max_uintx) \ 3358 \ 3359 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 3360 "Minimum number of segments in a code cache block") \ 3361 range(1, 100) \ 3362 \ 3363 notproduct(bool, ExitOnFullCodeCache, false, \ 3364 "Exit the VM if we fill the code cache") \ 3365 \ 3366 product(bool, UseCodeCacheFlushing, true, \ 3367 "Remove cold/old nmethods from the code cache") \ 3368 \ 3369 product(uintx, StartAggressiveSweepingAt, 10, \ 3370 "Start aggressive sweeping if X[%] of the code cache is free." \ 3371 "Segmented code cache: X[%] of the non-profiled heap." \ 3372 "Non-segmented code cache: X[%] of the total code cache") \ 3373 range(0, 100) \ 3374 \ 3375 /* AOT parameters */ \ 3376 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 3377 "Use AOT compiled files") \ 3378 \ 3379 product(ccstrlist, AOTLibrary, NULL, \ 3380 "AOT library") \ 3381 \ 3382 product(bool, PrintAOT, false, \ 3383 "Print used AOT klasses and methods") \ 3384 \ 3385 notproduct(bool, PrintAOTStatistics, false, \ 3386 "Print AOT statistics") \ 3387 \ 3388 diagnostic(bool, UseAOTStrictLoading, false, \ 3389 "Exit the VM if any of the AOT libraries has invalid config") \ 3390 \ 3391 product(bool, CalculateClassFingerprint, false, \ 3392 "Calculate class fingerprint") \ 3393 \ 3394 /* interpreter debugging */ \ 3395 develop(intx, BinarySwitchThreshold, 5, \ 3396 "Minimal number of lookupswitch entries for rewriting to binary " \ 3397 "switch") \ 3398 \ 3399 develop(intx, StopInterpreterAt, 0, \ 3400 "Stop interpreter execution at specified bytecode number") \ 3401 \ 3402 develop(intx, TraceBytecodesAt, 0, \ 3403 "Trace bytecodes starting with specified bytecode number") \ 3404 \ 3405 /* compiler interface */ \ 3406 develop(intx, CIStart, 0, \ 3407 "The id of the first compilation to permit") \ 3408 \ 3409 develop(intx, CIStop, max_jint, \ 3410 "The id of the last compilation to permit") \ 3411 \ 3412 develop(intx, CIStartOSR, 0, \ 3413 "The id of the first osr compilation to permit " \ 3414 "(CICountOSR must be on)") \ 3415 \ 3416 develop(intx, CIStopOSR, max_jint, \ 3417 "The id of the last osr compilation to permit " \ 3418 "(CICountOSR must be on)") \ 3419 \ 3420 develop(intx, CIBreakAtOSR, -1, \ 3421 "The id of osr compilation to break at") \ 3422 \ 3423 develop(intx, CIBreakAt, -1, \ 3424 "The id of compilation to break at") \ 3425 \ 3426 product(ccstrlist, CompileOnly, "", \ 3427 "List of methods (pkg/class.name) to restrict compilation to") \ 3428 \ 3429 product(ccstr, CompileCommandFile, NULL, \ 3430 "Read compiler commands from this file [.hotspot_compiler]") \ 3431 \ 3432 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 3433 "Read compiler directives from this file") \ 3434 \ 3435 product(ccstrlist, CompileCommand, "", \ 3436 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3437 \ 3438 develop(bool, ReplayCompiles, false, \ 3439 "Enable replay of compilations from ReplayDataFile") \ 3440 \ 3441 product(ccstr, ReplayDataFile, NULL, \ 3442 "File containing compilation replay information" \ 3443 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3444 \ 3445 product(ccstr, InlineDataFile, NULL, \ 3446 "File containing inlining replay information" \ 3447 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3448 \ 3449 develop(intx, ReplaySuppressInitializers, 2, \ 3450 "Control handling of class initialization during replay: " \ 3451 "0 - don't do anything special; " \ 3452 "1 - treat all class initializers as empty; " \ 3453 "2 - treat class initializers for application classes as empty; " \ 3454 "3 - allow all class initializers to run during bootstrap but " \ 3455 " pretend they are empty after starting replay") \ 3456 range(0, 3) \ 3457 \ 3458 develop(bool, ReplayIgnoreInitErrors, false, \ 3459 "Ignore exceptions thrown during initialization for replay") \ 3460 \ 3461 product(bool, DumpReplayDataOnError, true, \ 3462 "Record replay data for crashing compiler threads") \ 3463 \ 3464 product(bool, CICompilerCountPerCPU, false, \ 3465 "1 compiler thread for log(N CPUs)") \ 3466 \ 3467 develop(intx, CIFireOOMAt, -1, \ 3468 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3469 "(non-negative value throws OOM after this many CI accesses " \ 3470 "in each compile)") \ 3471 notproduct(intx, CICrashAt, -1, \ 3472 "id of compilation to trigger assert in compiler thread for " \ 3473 "the purpose of testing, e.g. generation of replay data") \ 3474 notproduct(bool, CIObjectFactoryVerify, false, \ 3475 "enable potentially expensive verification in ciObjectFactory") \ 3476 \ 3477 /* Priorities */ \ 3478 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3479 \ 3480 product(intx, ThreadPriorityPolicy, 0, \ 3481 "0 : Normal. "\ 3482 " VM chooses priorities that are appropriate for normal "\ 3483 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3484 " to normal native priority. Java priorities below " \ 3485 " NORM_PRIORITY map to lower native priority values. On "\ 3486 " Windows applications are allowed to use higher native "\ 3487 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3488 " not use the highest possible native priority, "\ 3489 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3490 " system threads. On Linux thread priorities are ignored "\ 3491 " because the OS does not support static priority in "\ 3492 " SCHED_OTHER scheduling class which is the only choice for "\ 3493 " non-root, non-realtime applications. "\ 3494 "1 : Aggressive. "\ 3495 " Java thread priorities map over to the entire range of "\ 3496 " native thread priorities. Higher Java thread priorities map "\ 3497 " to higher native thread priorities. This policy should be "\ 3498 " used with care, as sometimes it can cause performance "\ 3499 " degradation in the application and/or the entire system. On "\ 3500 " Linux this policy requires root privilege.") \ 3501 range(0, 1) \ 3502 \ 3503 product(bool, ThreadPriorityVerbose, false, \ 3504 "Print priority changes") \ 3505 \ 3506 product(intx, CompilerThreadPriority, -1, \ 3507 "The native priority at which compiler threads should run " \ 3508 "(-1 means no change)") \ 3509 range(min_jint, max_jint) \ 3510 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 3511 \ 3512 product(intx, VMThreadPriority, -1, \ 3513 "The native priority at which the VM thread should run " \ 3514 "(-1 means no change)") \ 3515 range(-1, 127) \ 3516 \ 3517 product(bool, CompilerThreadHintNoPreempt, false, \ 3518 "(Solaris only) Give compiler threads an extra quanta") \ 3519 \ 3520 product(bool, VMThreadHintNoPreempt, false, \ 3521 "(Solaris only) Give VM thread an extra quanta") \ 3522 \ 3523 product(intx, JavaPriority1_To_OSPriority, -1, \ 3524 "Map Java priorities to OS priorities") \ 3525 range(-1, 127) \ 3526 \ 3527 product(intx, JavaPriority2_To_OSPriority, -1, \ 3528 "Map Java priorities to OS priorities") \ 3529 range(-1, 127) \ 3530 \ 3531 product(intx, JavaPriority3_To_OSPriority, -1, \ 3532 "Map Java priorities to OS priorities") \ 3533 range(-1, 127) \ 3534 \ 3535 product(intx, JavaPriority4_To_OSPriority, -1, \ 3536 "Map Java priorities to OS priorities") \ 3537 range(-1, 127) \ 3538 \ 3539 product(intx, JavaPriority5_To_OSPriority, -1, \ 3540 "Map Java priorities to OS priorities") \ 3541 range(-1, 127) \ 3542 \ 3543 product(intx, JavaPriority6_To_OSPriority, -1, \ 3544 "Map Java priorities to OS priorities") \ 3545 range(-1, 127) \ 3546 \ 3547 product(intx, JavaPriority7_To_OSPriority, -1, \ 3548 "Map Java priorities to OS priorities") \ 3549 range(-1, 127) \ 3550 \ 3551 product(intx, JavaPriority8_To_OSPriority, -1, \ 3552 "Map Java priorities to OS priorities") \ 3553 range(-1, 127) \ 3554 \ 3555 product(intx, JavaPriority9_To_OSPriority, -1, \ 3556 "Map Java priorities to OS priorities") \ 3557 range(-1, 127) \ 3558 \ 3559 product(intx, JavaPriority10_To_OSPriority,-1, \ 3560 "Map Java priorities to OS priorities") \ 3561 range(-1, 127) \ 3562 \ 3563 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3564 "Java thread priority 10 maps to critical scheduling priority") \ 3565 \ 3566 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3567 "Compiler thread(s) run at critical scheduling priority") \ 3568 \ 3569 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3570 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3571 \ 3572 /* compiler debugging */ \ 3573 notproduct(intx, CompileTheWorldStartAt, 1, \ 3574 "First class to consider when using +CompileTheWorld") \ 3575 \ 3576 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3577 "Last class to consider when using +CompileTheWorld") \ 3578 \ 3579 develop(intx, NewCodeParameter, 0, \ 3580 "Testing Only: Create a dedicated integer parameter before " \ 3581 "putback") \ 3582 \ 3583 /* new oopmap storage allocation */ \ 3584 develop(intx, MinOopMapAllocation, 8, \ 3585 "Minimum number of OopMap entries in an OopMapSet") \ 3586 \ 3587 /* Background Compilation */ \ 3588 develop(intx, LongCompileThreshold, 50, \ 3589 "Used with +TraceLongCompiles") \ 3590 \ 3591 /* recompilation */ \ 3592 product_pd(intx, CompileThreshold, \ 3593 "number of interpreted method invocations before (re-)compiling") \ 3594 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 3595 \ 3596 product(double, CompileThresholdScaling, 1.0, \ 3597 "Factor to control when first compilation happens " \ 3598 "(both with and without tiered compilation): " \ 3599 "values greater than 1.0 delay counter overflow, " \ 3600 "values between 0 and 1.0 rush counter overflow, " \ 3601 "value of 1.0 leaves compilation thresholds unchanged " \ 3602 "value of 0.0 is equivalent to -Xint. " \ 3603 "" \ 3604 "Flag can be set as per-method option. " \ 3605 "If a value is specified for a method, compilation thresholds " \ 3606 "for that method are scaled by both the value of the global flag "\ 3607 "and the value of the per-method flag.") \ 3608 range(0.0, DBL_MAX) \ 3609 \ 3610 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3611 "Interpreter (tier 0) invocation notification frequency") \ 3612 range(0, 30) \ 3613 \ 3614 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3615 "C1 without MDO (tier 2) invocation notification frequency") \ 3616 range(0, 30) \ 3617 \ 3618 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3619 "C1 with MDO profiling (tier 3) invocation notification " \ 3620 "frequency") \ 3621 range(0, 30) \ 3622 \ 3623 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3624 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3625 range(0, 30) \ 3626 \ 3627 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3628 "Interpreter (tier 0) invocation notification frequency") \ 3629 range(0, 30) \ 3630 \ 3631 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3632 "C1 without MDO (tier 2) invocation notification frequency") \ 3633 range(0, 30) \ 3634 \ 3635 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3636 "C1 with MDO profiling (tier 3) invocation notification " \ 3637 "frequency") \ 3638 range(0, 30) \ 3639 \ 3640 product(intx, Tier2CompileThreshold, 0, \ 3641 "threshold at which tier 2 compilation is invoked") \ 3642 range(0, max_jint) \ 3643 \ 3644 product(intx, Tier2BackEdgeThreshold, 0, \ 3645 "Back edge threshold at which tier 2 compilation is invoked") \ 3646 range(0, max_jint) \ 3647 \ 3648 product(intx, Tier3InvocationThreshold, 200, \ 3649 "Compile if number of method invocations crosses this " \ 3650 "threshold") \ 3651 range(0, max_jint) \ 3652 \ 3653 product(intx, Tier3MinInvocationThreshold, 100, \ 3654 "Minimum invocation to compile at tier 3") \ 3655 range(0, max_jint) \ 3656 \ 3657 product(intx, Tier3CompileThreshold, 2000, \ 3658 "Threshold at which tier 3 compilation is invoked (invocation " \ 3659 "minimum must be satisfied)") \ 3660 range(0, max_jint) \ 3661 \ 3662 product(intx, Tier3BackEdgeThreshold, 60000, \ 3663 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3664 range(0, max_jint) \ 3665 \ 3666 product(intx, Tier3AOTInvocationThreshold, 10000, \ 3667 "Compile if number of method invocations crosses this " \ 3668 "threshold if coming from AOT") \ 3669 range(0, max_jint) \ 3670 \ 3671 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 3672 "Minimum invocation to compile at tier 3 if coming from AOT") \ 3673 range(0, max_jint) \ 3674 \ 3675 product(intx, Tier3AOTCompileThreshold, 15000, \ 3676 "Threshold at which tier 3 compilation is invoked (invocation " \ 3677 "minimum must be satisfied) if coming from AOT") \ 3678 range(0, max_jint) \ 3679 \ 3680 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 3681 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 3682 "if coming from AOT") \ 3683 range(0, max_jint) \ 3684 \ 3685 product(intx, Tier4InvocationThreshold, 5000, \ 3686 "Compile if number of method invocations crosses this " \ 3687 "threshold") \ 3688 range(0, max_jint) \ 3689 \ 3690 product(intx, Tier4MinInvocationThreshold, 600, \ 3691 "Minimum invocation to compile at tier 4") \ 3692 range(0, max_jint) \ 3693 \ 3694 product(intx, Tier4CompileThreshold, 15000, \ 3695 "Threshold at which tier 4 compilation is invoked (invocation " \ 3696 "minimum must be satisfied") \ 3697 range(0, max_jint) \ 3698 \ 3699 product(intx, Tier4BackEdgeThreshold, 40000, \ 3700 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3701 range(0, max_jint) \ 3702 \ 3703 product(intx, Tier3DelayOn, 5, \ 3704 "If C2 queue size grows over this amount per compiler thread " \ 3705 "stop compiling at tier 3 and start compiling at tier 2") \ 3706 range(0, max_jint) \ 3707 \ 3708 product(intx, Tier3DelayOff, 2, \ 3709 "If C2 queue size is less than this amount per compiler thread " \ 3710 "allow methods compiled at tier 2 transition to tier 3") \ 3711 range(0, max_jint) \ 3712 \ 3713 product(intx, Tier3LoadFeedback, 5, \ 3714 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3715 "reaches this amount per compiler thread") \ 3716 range(0, max_jint) \ 3717 \ 3718 product(intx, Tier4LoadFeedback, 3, \ 3719 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3720 "reaches this amount per compiler thread") \ 3721 range(0, max_jint) \ 3722 \ 3723 product(intx, TieredCompileTaskTimeout, 50, \ 3724 "Kill compile task if method was not used within " \ 3725 "given timeout in milliseconds") \ 3726 range(0, max_intx) \ 3727 \ 3728 product(intx, TieredStopAtLevel, 4, \ 3729 "Stop at given compilation level") \ 3730 range(0, 4) \ 3731 \ 3732 product(intx, Tier0ProfilingStartPercentage, 200, \ 3733 "Start profiling in interpreter if the counters exceed tier 3 " \ 3734 "thresholds by the specified percentage") \ 3735 range(0, max_jint) \ 3736 \ 3737 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3738 "Increase the compile threshold for C1 compilation if the code " \ 3739 "cache is filled by the specified percentage") \ 3740 range(0, 99) \ 3741 \ 3742 product(intx, TieredRateUpdateMinTime, 1, \ 3743 "Minimum rate sampling interval (in milliseconds)") \ 3744 range(0, max_intx) \ 3745 \ 3746 product(intx, TieredRateUpdateMaxTime, 25, \ 3747 "Maximum rate sampling interval (in milliseconds)") \ 3748 range(0, max_intx) \ 3749 \ 3750 product_pd(bool, TieredCompilation, \ 3751 "Enable tiered compilation") \ 3752 \ 3753 product(bool, PrintTieredEvents, false, \ 3754 "Print tiered events notifications") \ 3755 \ 3756 product_pd(intx, OnStackReplacePercentage, \ 3757 "NON_TIERED number of method invocations/branches (expressed as " \ 3758 "% of CompileThreshold) before (re-)compiling OSR code") \ 3759 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 3760 \ 3761 product(intx, InterpreterProfilePercentage, 33, \ 3762 "NON_TIERED number of method invocations/branches (expressed as " \ 3763 "% of CompileThreshold) before profiling in the interpreter") \ 3764 range(0, 100) \ 3765 \ 3766 develop(intx, MaxRecompilationSearchLength, 10, \ 3767 "The maximum number of frames to inspect when searching for " \ 3768 "recompilee") \ 3769 \ 3770 develop(intx, MaxInterpretedSearchLength, 3, \ 3771 "The maximum number of interpreted frames to skip when searching "\ 3772 "for recompilee") \ 3773 \ 3774 develop(intx, DesiredMethodLimit, 8000, \ 3775 "The desired maximum method size (in bytecodes) after inlining") \ 3776 \ 3777 develop(intx, HugeMethodLimit, 8000, \ 3778 "Don't compile methods larger than this if " \ 3779 "+DontCompileHugeMethods") \ 3780 \ 3781 /* New JDK 1.4 reflection implementation */ \ 3782 \ 3783 develop(intx, FastSuperclassLimit, 8, \ 3784 "Depth of hardwired instanceof accelerator array") \ 3785 \ 3786 /* Properties for Java libraries */ \ 3787 \ 3788 product(uint64_t, MaxDirectMemorySize, 0, \ 3789 "Maximum total size of NIO direct-buffer allocations") \ 3790 range(0, max_jlong) \ 3791 \ 3792 /* Flags used for temporary code during development */ \ 3793 \ 3794 diagnostic(bool, UseNewCode, false, \ 3795 "Testing Only: Use the new version while testing") \ 3796 \ 3797 diagnostic(bool, UseNewCode2, false, \ 3798 "Testing Only: Use the new version while testing") \ 3799 \ 3800 diagnostic(bool, UseNewCode3, false, \ 3801 "Testing Only: Use the new version while testing") \ 3802 \ 3803 /* flags for performance data collection */ \ 3804 \ 3805 product(bool, UsePerfData, true, \ 3806 "Flag to disable jvmstat instrumentation for performance testing "\ 3807 "and problem isolation purposes") \ 3808 \ 3809 product(bool, PerfDataSaveToFile, false, \ 3810 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3811 \ 3812 product(ccstr, PerfDataSaveFile, NULL, \ 3813 "Save PerfData memory to the specified absolute pathname. " \ 3814 "The string %p in the file name (if present) " \ 3815 "will be replaced by pid") \ 3816 \ 3817 product(intx, PerfDataSamplingInterval, 50, \ 3818 "Data sampling interval (in milliseconds)") \ 3819 range(PeriodicTask::min_interval, max_jint) \ 3820 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 3821 \ 3822 product(bool, PerfDisableSharedMem, false, \ 3823 "Store performance data in standard memory") \ 3824 \ 3825 product(intx, PerfDataMemorySize, 32*K, \ 3826 "Size of performance data memory region. Will be rounded " \ 3827 "up to a multiple of the native os page size.") \ 3828 range(128, 32*64*K) \ 3829 \ 3830 product(intx, PerfMaxStringConstLength, 1024, \ 3831 "Maximum PerfStringConstant string length before truncation") \ 3832 range(32, 32*K) \ 3833 \ 3834 product(bool, PerfAllowAtExitRegistration, false, \ 3835 "Allow registration of atexit() methods") \ 3836 \ 3837 product(bool, PerfBypassFileSystemCheck, false, \ 3838 "Bypass Win32 file system criteria checks (Windows Only)") \ 3839 \ 3840 product(intx, UnguardOnExecutionViolation, 0, \ 3841 "Unguard page and retry on no-execute fault (Win32 only) " \ 3842 "0=off, 1=conservative, 2=aggressive") \ 3843 range(0, 2) \ 3844 \ 3845 /* Serviceability Support */ \ 3846 \ 3847 product(bool, ManagementServer, false, \ 3848 "Create JMX Management Server") \ 3849 \ 3850 product(bool, DisableAttachMechanism, false, \ 3851 "Disable mechanism that allows tools to attach to this VM") \ 3852 \ 3853 product(bool, StartAttachListener, false, \ 3854 "Always start Attach Listener at VM startup") \ 3855 \ 3856 product(bool, EnableDynamicAgentLoading, true, \ 3857 "Allow tools to load agents with the attach mechanism") \ 3858 \ 3859 manageable(bool, PrintConcurrentLocks, false, \ 3860 "Print java.util.concurrent locks in thread dump") \ 3861 \ 3862 product(bool, TransmitErrorReport, false, \ 3863 "Enable error report transmission on erroneous termination") \ 3864 \ 3865 product(ccstr, ErrorReportServer, NULL, \ 3866 "Override built-in error report server address") \ 3867 \ 3868 /* Shared spaces */ \ 3869 \ 3870 product(bool, UseSharedSpaces, true, \ 3871 "Use shared spaces for metadata") \ 3872 \ 3873 product(bool, VerifySharedSpaces, false, \ 3874 "Verify shared spaces (false for default archive, true for " \ 3875 "archive specified by -XX:SharedArchiveFile)") \ 3876 \ 3877 product(bool, RequireSharedSpaces, false, \ 3878 "Require shared spaces for metadata") \ 3879 \ 3880 product(bool, DumpSharedSpaces, false, \ 3881 "Special mode: JVM reads a class list, loads classes, builds " \ 3882 "shared spaces, and dumps the shared spaces to a file to be " \ 3883 "used in future JVM runs") \ 3884 \ 3885 product(bool, PrintSharedArchiveAndExit, false, \ 3886 "Print shared archive file contents") \ 3887 \ 3888 product(bool, PrintSharedDictionary, false, \ 3889 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3890 "dictionary") \ 3891 \ 3892 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 3893 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3894 "Address to allocate shared memory region for class data") \ 3895 range(0, SIZE_MAX) \ 3896 \ 3897 product(bool, UseAppCDS, false, \ 3898 "Enable Application Class Data Sharing when using shared spaces") \ 3899 writeable(CommandLineOnly) \ 3900 \ 3901 product(ccstr, SharedArchiveConfigFile, NULL, \ 3902 "Data to add to the CDS archive file") \ 3903 \ 3904 product(uintx, SharedSymbolTableBucketSize, 4, \ 3905 "Average number of symbols per bucket in shared table") \ 3906 range(2, 246) \ 3907 \ 3908 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, true, \ 3909 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3910 "classes. Just exclude them from the shared dictionary.") \ 3911 \ 3912 diagnostic(bool, PrintMethodHandleStubs, false, \ 3913 "Print generated stub code for method handles") \ 3914 \ 3915 develop(bool, TraceMethodHandles, false, \ 3916 "trace internal method handle operations") \ 3917 \ 3918 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3919 "perform extra checks when constructing method handles") \ 3920 \ 3921 diagnostic(bool, ShowHiddenFrames, false, \ 3922 "show method handle implementation frames (usually hidden)") \ 3923 \ 3924 experimental(bool, TrustFinalNonStaticFields, false, \ 3925 "trust final non-static declarations for constant folding") \ 3926 \ 3927 diagnostic(bool, FoldStableValues, true, \ 3928 "Optimize loads from stable fields (marked w/ @Stable)") \ 3929 \ 3930 develop(bool, TraceInvokeDynamic, false, \ 3931 "trace internal invoke dynamic operations") \ 3932 \ 3933 diagnostic(int, UseBootstrapCallInfo, 1, \ 3934 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 3935 "resolved before the bootstrap method is called; 1: when a BSM " \ 3936 "that may accept a BootstrapCallInfo is detected, use that API " \ 3937 "to pass BSM arguments, which allows the BSM to delay their " \ 3938 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 3939 "via that API, instead of with the eagerly-resolved array.") \ 3940 \ 3941 diagnostic(bool, PauseAtStartup, false, \ 3942 "Causes the VM to pause at startup time and wait for the pause " \ 3943 "file to be removed (default: ./vm.paused.<pid>)") \ 3944 \ 3945 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3946 "The file to create and for whose removal to await when pausing " \ 3947 "at startup. (default: ./vm.paused.<pid>)") \ 3948 \ 3949 diagnostic(bool, PauseAtExit, false, \ 3950 "Pause and wait for keypress on exit if a debugger is attached") \ 3951 \ 3952 product(bool, ExtendedDTraceProbes, false, \ 3953 "Enable performance-impacting dtrace probes") \ 3954 \ 3955 product(bool, DTraceMethodProbes, false, \ 3956 "Enable dtrace probes for method-entry and method-exit") \ 3957 \ 3958 product(bool, DTraceAllocProbes, false, \ 3959 "Enable dtrace probes for object allocation") \ 3960 \ 3961 product(bool, DTraceMonitorProbes, false, \ 3962 "Enable dtrace probes for monitor events") \ 3963 \ 3964 product(bool, RelaxAccessControlCheck, false, \ 3965 "Relax the access control checks in the verifier") \ 3966 \ 3967 product(uintx, StringTableSize, defaultStringTableSize, \ 3968 "Number of buckets in the interned String table") \ 3969 range(minimumStringTableSize, 111*defaultStringTableSize) \ 3970 \ 3971 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3972 "Number of buckets in the JVM internal Symbol table") \ 3973 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 3974 \ 3975 product(bool, UseStringDeduplication, false, \ 3976 "Use string deduplication") \ 3977 \ 3978 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3979 "A string must reach this age (or be promoted to an old region) " \ 3980 "to be considered for deduplication") \ 3981 range(1, markOopDesc::max_age) \ 3982 \ 3983 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3984 "Force table resize every time the table is scanned") \ 3985 \ 3986 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3987 "Force table rehash every time the table is scanned") \ 3988 \ 3989 diagnostic(bool, WhiteBoxAPI, false, \ 3990 "Enable internal testing APIs") \ 3991 \ 3992 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3993 "Default survivor space alignment in bytes") \ 3994 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 3995 \ 3996 product(bool , AllowNonVirtualCalls, false, \ 3997 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3998 \ 3999 product(ccstr, DumpLoadedClassList, NULL, \ 4000 "Dump the names all loaded classes, that could be stored into " \ 4001 "the CDS archive, in the specified file") \ 4002 \ 4003 product(ccstr, SharedClassListFile, NULL, \ 4004 "Override the default CDS class list") \ 4005 \ 4006 diagnostic(ccstr, SharedArchiveFile, NULL, \ 4007 "Override the default location of the CDS archive file") \ 4008 \ 4009 product(ccstr, ExtraSharedClassListFile, NULL, \ 4010 "Extra classlist for building the CDS archive file") \ 4011 \ 4012 experimental(size_t, ArrayAllocatorMallocLimit, \ 4013 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 4014 "Allocation less than this value will be allocated " \ 4015 "using malloc. Larger allocations will use mmap.") \ 4016 \ 4017 experimental(bool, AlwaysAtomicAccesses, false, \ 4018 "Accesses to all variables should always be atomic") \ 4019 \ 4020 product(bool, EnableTracing, false, \ 4021 "Enable event-based tracing") \ 4022 \ 4023 product(bool, UseLockedTracing, false, \ 4024 "Use locked-tracing when doing event-based tracing") \ 4025 \ 4026 diagnostic(bool, UseUnalignedAccesses, false, \ 4027 "Use unaligned memory accesses in Unsafe") \ 4028 \ 4029 product_pd(bool, PreserveFramePointer, \ 4030 "Use the FP register for holding the frame pointer " \ 4031 "and not as a general purpose register.") \ 4032 \ 4033 diagnostic(bool, CheckIntrinsics, true, \ 4034 "When a class C is loaded, check that " \ 4035 "(1) all intrinsics defined by the VM for class C are present "\ 4036 "in the loaded class file and are marked with the " \ 4037 "@HotSpotIntrinsicCandidate annotation, that " \ 4038 "(2) there is an intrinsic registered for all loaded methods " \ 4039 "that are annotated with the @HotSpotIntrinsicCandidate " \ 4040 "annotation, and that " \ 4041 "(3) no orphan methods exist for class C (i.e., methods for " \ 4042 "which the VM declares an intrinsic but that are not declared "\ 4043 "in the loaded class C. " \ 4044 "Check (3) is available only in debug builds.") \ 4045 \ 4046 diagnostic_pd(intx, InitArrayShortSize, \ 4047 "Threshold small size (in bytes) for clearing arrays. " \ 4048 "Anything this size or smaller may get converted to discrete " \ 4049 "scalar stores.") \ 4050 range(0, max_intx) \ 4051 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 4052 \ 4053 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 4054 "Disable backwards compatibility for compile commands.") \ 4055 \ 4056 diagnostic(bool, CompilerDirectivesPrint, false, \ 4057 "Print compiler directives on installation.") \ 4058 diagnostic(int, CompilerDirectivesLimit, 50, \ 4059 "Limit on number of compiler directives.") \ 4060 \ 4061 product(ccstr, AllocateHeapAt, NULL, \ 4062 "Path to the directoy where a temporary file will be created " \ 4063 "to use as the backing store for Java Heap.") \ 4064 \ 4065 develop(bool, VerifyMetaspace, false, \ 4066 "Verify metaspace on chunk movements.") \ 4067 \ 4068 4069 4070 4071 /* 4072 * Macros for factoring of globals 4073 */ 4074 4075 // Interface macros 4076 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4077 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4078 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4079 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 4080 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4081 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4082 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4083 #ifdef PRODUCT 4084 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 4085 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 4086 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 4087 #else 4088 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4089 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4090 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4091 #endif // PRODUCT 4092 // Special LP64 flags, product only needed for now. 4093 #ifdef _LP64 4094 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4095 #else 4096 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4097 #endif // _LP64 4098 4099 // Implementation macros 4100 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4101 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4102 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4103 #define MATERIALIZE_PD_DIAGNOSTIC_FLAG(type, name, doc) type name = pd_##name; 4104 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4105 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4106 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4107 #ifdef PRODUCT 4108 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) 4109 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) 4110 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 4111 #else 4112 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4113 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4114 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4115 #endif // PRODUCT 4116 #ifdef _LP64 4117 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4118 #else 4119 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4120 #endif // _LP64 4121 4122 // Only materialize src code for range checking when required, ignore otherwise 4123 #define IGNORE_RANGE(a, b) 4124 // Only materialize src code for contraint checking when required, ignore otherwise 4125 #define IGNORE_CONSTRAINT(func,type) 4126 4127 #define IGNORE_WRITEABLE(type) 4128 4129 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4130 DECLARE_PD_DEVELOPER_FLAG, \ 4131 DECLARE_PRODUCT_FLAG, \ 4132 DECLARE_PD_PRODUCT_FLAG, \ 4133 DECLARE_DIAGNOSTIC_FLAG, \ 4134 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4135 DECLARE_EXPERIMENTAL_FLAG, \ 4136 DECLARE_NOTPRODUCT_FLAG, \ 4137 DECLARE_MANAGEABLE_FLAG, \ 4138 DECLARE_PRODUCT_RW_FLAG, \ 4139 DECLARE_LP64_PRODUCT_FLAG, \ 4140 IGNORE_RANGE, \ 4141 IGNORE_CONSTRAINT, \ 4142 IGNORE_WRITEABLE) 4143 4144 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4145 DECLARE_PD_DEVELOPER_FLAG, \ 4146 DECLARE_PRODUCT_FLAG, \ 4147 DECLARE_PD_PRODUCT_FLAG, \ 4148 DECLARE_DIAGNOSTIC_FLAG, \ 4149 DECLARE_PD_DIAGNOSTIC_FLAG, \ 4150 DECLARE_NOTPRODUCT_FLAG, \ 4151 IGNORE_RANGE, \ 4152 IGNORE_CONSTRAINT, \ 4153 IGNORE_WRITEABLE) 4154 4155 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, \ 4156 DECLARE_PRODUCT_FLAG, \ 4157 DECLARE_DIAGNOSTIC_FLAG, \ 4158 DECLARE_EXPERIMENTAL_FLAG, \ 4159 DECLARE_NOTPRODUCT_FLAG, \ 4160 IGNORE_RANGE, \ 4161 IGNORE_CONSTRAINT, \ 4162 IGNORE_WRITEABLE) 4163 4164 // Extensions 4165 4166 #include "runtime/globals_ext.hpp" 4167 4168 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP